Have you tried running carbon? Could be alleopathy from the LPS/softies in a small tank.
As far as Marie's possible issues with CO2, the two possible issues that could be caused are a lowering of pH and then ORP as more CO2 enters your system. Having a pH controller and solenoid is the preventative measure. Running a kalk reactor or an extra effluent chamber to counteract excess CO2 is the reactive measure if problems persist.
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