And just for the record about those TINY snowflake eels...I had one in a 29g actually for about 1-2 years, although, believe me, it outgrew it, and after 3-4 years started to get a little cramped in a 75g tank.
Id look at engineer gobies, some blennies like the midas, mabe the fresh water morays, they dont get quite as big, probably suitable for a 29g for a long time, if not for life.
Jon