Changing My 29g/110l

Honestly 4 is too many and 3 is skirting the requirements. Remember Firemouths will reach up to 6 inches. A general rule of thumb is to keep a pair in nothing less than a 25, 4 in 50 and so forth. Of course this is open to your individual interpretation.
 
Honestly 4 is too many and 3 is skirting the requirements. Remember Firemouths will reach up to 6 inches. A general rule of thumb is to keep a pair in nothing less than a 25, 4 in 50 and so forth. Of course this is open to your individual interpretation.

how big for 1 FM?
 

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