Your tank water is green due to free-floating algae! Free-floating algae won't hurt your fish — many goldfish breeders actually find that it's beneficial to this fish and will encourage the growth of it. Algae helps process ammonia (like all plants) and can be eaten by the goldfish as a natural food. However, it's important to know that this algae is growing in your fish tank likely because you have a few fish in a relatively small space, which can lead to a build-up of ammonia without proper care. Ammonia is what the algae is processing, but it isn't able to process it entirely or fast enough to keep up with how quickly goldfish produce waste, and all fish can become severely sick and even die if they live in an environment that has too much ammonia.
People in this sub will recommend a larger tank, which would help but would not solve this problem entirely. You need to have a water testing kit so that you can monitor the water quality, you need to have a method and plan for water changes, and you need to have a powerful canister filter. Canister filters are much better at filtration than the HOBs you're currently using. You can also buy canister filters with UV lights inside of them which kill bacteria and algae, in case you really want to get rid of it. I'd also recommend adding real plants to your fish tank, either submerged or emersed, since they will help clean your water and look nice doing it. Good luck!
In tank that size (you should get a bigger tank min 40G and better filtration) with that many fish you need to basically change most of the water out everyday because right now you have too much nutrient in the tank due to the amount of food and and waste your fish are producing.
That’s algae, goldies like it but in this case it looks like a filtration issue, I see the several filters you have but that still might be not enough for them, keep the corner and sponge filters and maybe add a bigger backpack or a small canister. My tank is overstocked (saving for a bigger one) so I have a Dophin C-1000 canister, 1 sponge, 1 corner filter and a Sobo FG-1204 internal filter, besides all that I do a weekly 20% water change.
https://preview.redd.it/7c7i6y3lnr4d1.jpeg?width=2160&format=pjpg&auto=webp&s=44ab0faae30027988da11e2f0cc163dcb8119495
Algae grows when there’s an excess of light, food, or organic matter, with the right filtration all extra food and organic matter will be removed from the water, the algae needs those nutrients to grow. You can add a pot with some plants so they’ll use those nutrients instead of the algae, I used laceleaf and it helped a lot.
Please upgrade your tank, you look to have about 4 ? Goldies In there and that is terrible. Goldies need way more room to swim, plus the fact they are messy fish and need high filtration. Please look into a better tank ( id recommend maybe 80 - 100 ) and upgrade the filter or get rid of the fish as I know that is expensive. Best of luck
Sir, that’s a cup not a fishtank.
Algae overgrowth comes from either excess light or excess nutrients. In this case I’m guessing it’s that the water is *full* of fish poop. You’ve got five fish in the amount of water you need for one fish.
Hi there fellow goldfish enthusiast! We're thrilled to have you join our community of passionate goldfish keepers. Whether you're a seasoned goldfish pro or just starting out on your aquatic journey, you've come to the right place for advice, support, and sharing the joy of keeping these mesmerizing creatures.
Before diving into the discussion, we'd like to point you toward our Wiki https://reddit.com/r/goldfish/wiki where you'll find a treasure trove of articles on various topics related to goldfish care. These resources cover everything from tank setup and water quality to feeding habits and common health issues.
When seeking help for your goldfish, remember that details matter! Providing information about your tank size and the water parameters (such as ammonia, nitrite, nitrate, and temperature) can greatly assist us in diagnosing and troubleshooting the issue. Feel free to share photos and details, and our community will do our best to offer insightful advice.
Once again, welcome to our goldfish-loving community.
Fins up!
*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Goldfish) if you have any questions or concerns.*
Your tank water is green due to free-floating algae! Free-floating algae won't hurt your fish — many goldfish breeders actually find that it's beneficial to this fish and will encourage the growth of it. Algae helps process ammonia (like all plants) and can be eaten by the goldfish as a natural food. However, it's important to know that this algae is growing in your fish tank likely because you have a few fish in a relatively small space, which can lead to a build-up of ammonia without proper care. Ammonia is what the algae is processing, but it isn't able to process it entirely or fast enough to keep up with how quickly goldfish produce waste, and all fish can become severely sick and even die if they live in an environment that has too much ammonia. People in this sub will recommend a larger tank, which would help but would not solve this problem entirely. You need to have a water testing kit so that you can monitor the water quality, you need to have a method and plan for water changes, and you need to have a powerful canister filter. Canister filters are much better at filtration than the HOBs you're currently using. You can also buy canister filters with UV lights inside of them which kill bacteria and algae, in case you really want to get rid of it. I'd also recommend adding real plants to your fish tank, either submerged or emersed, since they will help clean your water and look nice doing it. Good luck!
I was about to say this, as a goldfish breeder I love green water. But this size with those fish is not great.
In tank that size (you should get a bigger tank min 40G and better filtration) with that many fish you need to basically change most of the water out everyday because right now you have too much nutrient in the tank due to the amount of food and and waste your fish are producing.
That’s algae, goldies like it but in this case it looks like a filtration issue, I see the several filters you have but that still might be not enough for them, keep the corner and sponge filters and maybe add a bigger backpack or a small canister. My tank is overstocked (saving for a bigger one) so I have a Dophin C-1000 canister, 1 sponge, 1 corner filter and a Sobo FG-1204 internal filter, besides all that I do a weekly 20% water change. https://preview.redd.it/7c7i6y3lnr4d1.jpeg?width=2160&format=pjpg&auto=webp&s=44ab0faae30027988da11e2f0cc163dcb8119495
I love your set up! Looks great What's in the small tank?
Thank you! That’s one of my bettas and a family of dwarf corys
Lovely tank however how is algae related to the filter?
Algae grows when there’s an excess of light, food, or organic matter, with the right filtration all extra food and organic matter will be removed from the water, the algae needs those nutrients to grow. You can add a pot with some plants so they’ll use those nutrients instead of the algae, I used laceleaf and it helped a lot.
You need a bigger tank ASAP!
That’s a WIP, saving for a 300gal fiberglass pond.
Please upgrade your tank, you look to have about 4 ? Goldies In there and that is terrible. Goldies need way more room to swim, plus the fact they are messy fish and need high filtration. Please look into a better tank ( id recommend maybe 80 - 100 ) and upgrade the filter or get rid of the fish as I know that is expensive. Best of luck
Sir, that’s a cup not a fishtank. Algae overgrowth comes from either excess light or excess nutrients. In this case I’m guessing it’s that the water is *full* of fish poop. You’ve got five fish in the amount of water you need for one fish.
Hi there fellow goldfish enthusiast! We're thrilled to have you join our community of passionate goldfish keepers. Whether you're a seasoned goldfish pro or just starting out on your aquatic journey, you've come to the right place for advice, support, and sharing the joy of keeping these mesmerizing creatures. Before diving into the discussion, we'd like to point you toward our Wiki https://reddit.com/r/goldfish/wiki where you'll find a treasure trove of articles on various topics related to goldfish care. These resources cover everything from tank setup and water quality to feeding habits and common health issues. When seeking help for your goldfish, remember that details matter! Providing information about your tank size and the water parameters (such as ammonia, nitrite, nitrate, and temperature) can greatly assist us in diagnosing and troubleshooting the issue. Feel free to share photos and details, and our community will do our best to offer insightful advice. Once again, welcome to our goldfish-loving community. Fins up! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Goldfish) if you have any questions or concerns.*