A pair of Firemouths would do well in a 29 gallon.
The males generally get between 6-7"s, while the females grow to about 4-5"s.
A pH from 7-8.5 is acceptable, as long as it is consistant.
I would seriously consider a very find substrate, such as sand. My Firemouths LOVE excavating the sand looking for small particles of food. Plus they keep the sand loose, so there's no chance of anaerobic pockets.
A healthy full grown Firemouth is a sight to see. Their coloration is amazing!
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I know Firemouths do a pretty good job of cleaning up food, but is there something cool that can clean up after them that they won't kill like a pictus cat, cory cats, or silver dollars? something that would go with them in a 29
I had a gorgeous firemouth who tore up a pleco