What fish is compatible?

Question

what fish is easy to keep that grows to 4" in length and is sold in most fish stores like petco or petsmart, can it go with a red tail shark and a blue gourami in a 20 gallon tank?

Answer 1

I would not add more fish until you get a larger tank.

From the information I've found:

Your Red Tailed Shark can outgrow your tank all by itself.

Your Blue Gourami can reach up to 5" in length."

Your Pleco also can also get quite big. (5.1")

Answer 2

eels are cool and a sucker fish is a pleco

Answer 3

A SUCKER FISH!!!!!

Answer 4

loaches or african frogs  

Answer 5

Dwarf Gourami.