build one...buy a float valve. a rubbermaid containter. some 1/4 hose. and a fitting. you just have to make the rubbermaid higher than the float valve. drill a hole in the bottom and put the fitting. connect container to float valve. and BOOM! all you gotta do is keep water inside the rubbermaid and you'r tank will be a constant level! then when you're a baller and want a kalk reactor you just run it inbetween the float and rubbermaid. goodluck!
I would get a tunze ATO. I got one and it works great. You can hook it up to a kalk reactor and it has many safety features. This unit will go on all of my tanks forever!
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