May I make a suggestion, no need for a heater in the ato as it adds small amounts of water to the system at various times. Cover up the ato resevoir and add an airstone to circulate/aerate/agitate the water. If you dose liquid supplements you can add magnesium and alk to the ato and it will act as a doser. To cover up the ato tank you can use plastic sign board, easy to work with, make cuts for tubes, plugs, hoses. I found a sheet of 4x8' at industrial plastics for cheap, you can also use it to cover parts of your sump. Since covering my sump I have lost 25% less water than when I didn't. My sump has a middle refuge which I used glass the rest was the sign board.
Nice progress btw, are you adding sand or is it BB?
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90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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