New reefer here! hello.

Saltwater is very very different than freshwater. Different terminology, different equipment, different water parameters, and much different water quality standards. It really isn't something you just pick up as you go like freshwater where you can jam 20 fish in a 10 gallon tank. This is really something you need to research and learn as much a you can.

I've been late to the party too much around here. HOWEVER.

:cracks freshwater knuckles:
This is wrong. You absolutely shouldn't have 20 fish in a 10 gallon freshwater tank. They deserve just as much respect as the salties do.