Who Gives A Fish Forums

Adding more fish isn't just about space. It's about filtration too. What kind of filter are you running? If it's not strong enough, you'll have issues.

Yeah, filtration's key. I've got a sponge filter and a HOB on my 20-gallon, and it handles the load fine. But if you're just running a basic filter, might wanna upgrade first.

Thanks for the advice, everyone. I'll hold off for now and maybe look into some plants instead.