Re: is my fish dying? help!
#10
Ouch, only 20cm x 20cm is incredibly small, it's what is commonly known as a "Death Chamber", which is what we call any tank that is too small to house fish.
Your tank only has a total volume of 8 Ltr, but, will only actually hold 6 or 7 ltrs of useful water volume.
Your fish are really pond fish, as are all single tailed Goldfish, for this reason they need huge tanks & excellent filtration.
For single tailed Goldfish I'd recommend nothing short of 200Ltrs, even whilst they are small, or preferably a pond.
I'm afraid your fish stand little chance of survival & will certainly have health issues in such a small volume of water. Upgrading thier accomodation should be considered a priority.
Sorry it's not better news
Jay
"Treatment when the treatment is worse than the disease kills fish"