Hi,
Not wanting to confuse you any more, but... my tank similar size to yours...
I started with glowlight tetras - 5. These are fairly hardy, and I've have no problems! - also nice to look at!
Don't get neons to begin (I know you weren't thinking bout this anyway) - they're not hardy!
I have 4 male guppies - they get on fine together, I got mine in 2's, they pretty much pair off, but do swim in a group, and agter the initial finding out who is boss, they get on well!
I also have male dwarf gouramis which are nice and bright, and get on well with the rest!
Ooh - for the bottom of the tank... I have bristlenose plecs, which don't get as big as a lot of plecs, and they are good at keeping algae to a minimum!
Hope this helps!!
Ooh - just get 1 bristlenose plec, as they breed easily!!!
Laura
Ps - your bearded dragon looks brill!!