cold water

Hey everyone, I am currently stocking a 20 gallon long and I was wondering if I could get some advice on my stocking ideas. I checked on Aqadvisor and they both seem to check out. I am running a Fluval 206 canister at the moment and can add a U4 internal or C4 HOB if needed. 1) Barb Tank: 5-6...

HEY so Im doing a project on Goldfish memory span (Comet tails). I plan on keeping 15 in a 20 gallon tank. I'm aware that its not a great idea to do that but I bought two 20 gallon filters, will start growing the bacteria, and other stuff to increase their survival and comfort. I do not have...