06-02-2011, 11:19 AM
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Given that it is a long tank and there are plants, and if you are regular in weekly partial water changes, and ensure compatible fish in all respects...there is room for another group of smallish peaceful fish.
Look for mid-to-upper level fish (the Ram remains close to the substrate, and there are corys too), rasbora are mid/upper level. Smallish, quiet (not active swimmers) will match what you have and that is a major part of compatibility. Plenty to select from; hatchetfish, some pencilfish species, sparkling gourami, eyespot rasbora, etc.