01-12-2011, 07:04 PM
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Not a problem with numbers, but here again there are incompatible fish, this time in terms of water parameters.
Mollies absolutely must have basic harder water. They will succumb to fungus and all sorts of issues in soft acidic water.
At the opposite, rummy nose tetra are not at their best in basic hard water, at least not to their full potential lifespan. As noted in our profiles [see Hemigrammus bleheri], this species should have soft, acidic water. They are wild caught, like most cardinal tetra, and share identical needs with respect to water.
The other fish are inclined to soft, acidic water too, but are adaptable to slightly basic water, pH in the low to mid 7's. I would not subject rummynose to this. I don't know what your water parameters are, but this is a significant part of compatibility.