I was hoping somebody might have experience with Ice Probes. I have one on my 10 gal sump for 20 gal tank and it works pretty good. Temperature has stayed consistantly at 80deg now for all of the summer. I'll turn it down to 78deg when it starts getting cooler. I am soon going to be moving all of the 20gal occupants to a 40gal with about a 15gal sump. I would like to use the Ice Probe I have on the new tank. I don't think this will be enough cooloing however. I know people add additional Ice Probes for larger tanks. What I don't know is, would you need a second controller for the second Ice Probe. I can't find information anywhere on this. Even if I have to buy a second controller, at this point it will still be cheaper than a new inline chiller but I'd like to know before I buy another one. Thanks in advance. You guys have saved my life. I mean that. Without you, I would have spent WAY too much money and my wife would have killed me. So, you see, you guys saved my life.