I'd suggest going heavy on the snails. Larger (1" or so) turbo snails really do a good job of mowing down algae, especially keeping the glass clean. I'd suggest 5 or 6 of them.
From there, I'd suggest making the move over to a reef (after solving your algae issue) and figure out what you need from there. If you see any bubble algae or macro algae growing through you rocks you don't want to grow there, pick up an emerald crap - I really like mine and seems to help mow down a good bit of oddball algae. Throw in more hermits if you see food or anything sitting around for a while.
I have a 30g reef and currently have 2 larger turbos (2 or 3 died off over the past year and LFS is out), about 10 blue leggers, about 10 random red legged reef crabs the LFS had, an emerald crab, and probably 15-20 (don't see 'em much, sand bed stuff) snails that look like they have snorkels - nassarius or similar I beleive - if sharkbait is around he could help me out. Also, a coral banded shrimp if you want to count it in there.
Do you run a protien skimmer? I recently bought a used AquaC Remora (thanks engineer) and it pulls brown sludge outta the water; helps a lot in a 30g cause it's enough water you can't do large water changes easily but not big enough for huge ones - I'd suggest some 5g buckets.
Good Luck!