06-09-2009, 02:59 PM
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Agreed. You're eventually going to need at least a 75g tank in order to keep the oscar, although the convict can stay in that tank long term. If you plan on upgrading to at least a 75g tank, good tankmates include large schooling fish, other medium-aggressive large cichlids, plecos, large loaches, and things like banded leporinus. Keep in mind that some of these get quite big so you'd need an even bigger tank. For example, for an oscar and a good herd of clown loaches, I'd want something like a 180g tank.
But, as was pointed out, the oscar isn't going to last long in a 29g tank as he will quickly outgrow it, so I can't really recommend any tankmates in a tank of that size.