I want to get a peacock eel or two but some sites are saying brackish and some are saying fresh. I had the tank planned out for fresh but now I have to rethink the tank mates. Would 2 eels be fine in a 40 gallon or should I stick with 1? What should I put in there with them? How much salt do I add? There's not many brackish fish options here and would like to stay as cheap as possible. If I can't find much I'll probably have mostly mollies and maybe a catfish. Shrimp would be cool but I'm not sure if that would work.