I've been pondering a couple things now; did I already mess up by not putting RO water in there? Would CC would be a good substrate for this, as the tank is small? I have a filter running with no media, and a powerhead in there and currently being heated with a Hagen heater, and I have two more choices for backup heating. Put the smaller heater in the partof the filter where the water collects, or just put another Hagen heater somewhere in the tank (maybe horizontal?)?
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