I like the Visitherm line of heaters. Both the regular and the stealth product lines are very reliable and seem to just go on and on. I pick mine up by checking on Ebay and at places like Dr Foster Smith or BigAls on line. Another way to go is to price a heater on the Petsmart on line store then ask the local Petsmart to match the price. It will cost a bit more than one of the other stores listed but will save you the shipping.

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Fishless cycling