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I use it for controlling my temp (5 heaters) dosing pumps + some lights. I also dont se why not on big tanks, you can get PH probes and all other kinds of probesfor it (as with all units, you can build it a fair bit) thy also have a ad on for controlling LED units, it might not be as fancy as a GHL ore apex, but it dous the job realy well, and it is as simpel as counting 1,2,3 I do beleave thee are brands out there that can do more, but when you want it all but dont have all the $, I dont se where the RK lite would be dangerous for a larg tank. it could be gust what makes you feel comforteble. for me, it is 20X better than those darn disc things that always fail, and it contrils the temp of the tank up to the .1 degree |