I started assembling stuff for my new tank some time ago. I already had the ALD (leak) module and some sensors for that. But, I will have two separate returns (for redundancy), a Turbo's Algae Turf Scrubber, UV, chiller and possibly a remote refugium (for pods and acclimation). So, a couple more 1" sensors and a couple optical sensors will fill up two of those modules. Of course, I would also like to have an optical sensor in my ATO reservoir and maybe a high and low level sensor in the sump. Is there no end to this?