I'm gonna be starting another tank either a 20 long or 15 gallon which ever you guys think is better I want it to be zoa dominated I have a dual t5 would that be enough or should I get a second one also will a hydro 420 be enough for and what could I do to promote them to multiply faster also what are some cool zoos I should look into I currently have purple sun zoa , ring of fire, fire and ice ,