I plan to buy a 20 gal long this weekend with standard filtration and heating and most likely pool filter sand as substrate.
Question is: what sort of tank should it be?

I want to know what type of fish I'm going to have before I set up the aquascape so that it looks good and makes me and my fish happy.
I like all of these and was just wondering which one gives the most satisfaction. I want to try and pull for at least one successful spawn (possibly others) before I introduce maybe some more fish.
Any suggestions/ideas?
Question is: what sort of tank should it be?
Convict breeding pair???
ORShell Dweller harem???
ORDwarf Cichlid breeding pair???
I want to know what type of fish I'm going to have before I set up the aquascape so that it looks good and makes me and my fish happy.
I like all of these and was just wondering which one gives the most satisfaction. I want to try and pull for at least one successful spawn (possibly others) before I introduce maybe some more fish.
Any suggestions/ideas?

no replies?
Please. comon' mfk, i know i ask a lot of questions, but i want to be the most informed before i take on the responsibility for another fish's life.