My aquarium is in the final stage of cycling, and I am deciding between 4 different fish. My tank is a 20 gallon tall with led lights,heater, 2 hob filters and air stone. My ph is 7.4. KH is 5 GH is 6. The fish I like are: Neon tetra Harlequin rasbora Black skirt tetra Tiger barb ( I read they are semi aggressive) Can someone help me?