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I have three tanks on one apex. Yes, separate pm1 modules, probes and eb832 units. But they are all in the same room, and can connect by the aquabus no problem. What you are describing is not unique to Apex. The more tanks you have, the more things you have to buy. Now that there are cheaper units available, I suggest weighing the pro/cons of separate modules vs a new Apex head unit or another controller brand. Controllers are not required for reefing, however. It is a choice we make with the understanding that we are paying for the extra convenience; Well, when it works!