Hi everyone. I have a 40g breeder with an apex jr unit, which allows for 7 modules. Here’s the modules I already have: 2 energy bars, ph, salinity, DOS, and display (but I’m not sure if the display counts). I have two more available plugs on my energy bars, which I’ll probably use for a fan and maybe an ato for my rodi reservoir. So I have either one or two more modules I can add. I don’t plan on upgrading my apex until it stops working, so I want to make the best decision for my tank. I’m thinking of either the FMK and/or the leak detection kit. If the leak detection kit can plug into the FMK (I think it can), that might only count for one module. I want the FMK for my return line because I just plumbed a uv sterilizer into my return pump and want the option of programming it to turn off if the flow stops. The leak detection is my second choice, with a sensor in my auto water change area and sensors under the return and overflow plumbing. Any advice including other options is greatly appreciated!