06-01-2013, 10:47 AM
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If the temp of this tank is around 80F as it should be for the blue ram, your options will have to be carefully selected. The white clouds should not be this warm, and many corys the same. There are a few corys that manage in warmth, like the Corydoras sterbai, C. leucomelas, and a couple others, check our profiles.
The Tigers and Serpae both carry the problem of likely fin nipping unless the group is large enough, and a 30g is the smallest tank recommended for a group of either of these on their own, so I would forget them. Black Skirts have a bit of the same problem but not as much, though their size may be an issue.