Would have to be a pygmy angel, pretty small because they are very active. A coral beauty, rusty angel, midnight angel, lemonpeel,Eibli angel, and the list goes on.
I'm planning to update the filter anyway but I'm not sure how extreme I have to go with a new one. As for lighting, it has a basic hallogen light but I'm not planning to have coral so I thought that would be fine.
search online for the aquaclear 110 fuge conversion ive done these its easy just the ac110 sealant,cutters and a small light this should only cost you like a buc using good mud