Re: heating tanks...
I keep my tanks (30 gal each) at 110 all the time. My 300 watt heaters are made of glass so they are perfectly safe. More importantly the tanks which are basically just large plastic garbage cans, are insulated using cheap bubble plastic used to insulate your household hot water tank.
Pumps well that depends on the solution. If you're doing Flash copper you can leave it in all the time. For Nickel the pump is replaced by an aquarium air pump with flexible plastic hose. This runs on a timer 15 min every hour proper temperature distribution. Pumps do not last in acid copper so this one is tougher to keep uniformly warm just like the chrome solution.
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