FMM maximum?

[ca1ore]

Is there a maximum number of FMM that one should not exceed? Thinking of adding a fifth. Don’t think it’s a problem.

 

[SuncrestReef]

The Apex can support a maximum of 49 modules, unless you have the Apex Jr. which is limited to 7 modules. It doesn't matter if they are all FMM's or a combination of other types.

See my Apex Hardware Overview article for details on all the optional modules:
https://www.reef2reef.com/ams/apex-hardware-overview.775/