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					Originally Posted by  Myka
					 
				 
				Why is your sump almost overflowing?  Where is all the back flow coming from?  Did I miss it somewhere, or is the bottom of your tank blue?  Leaving it bare-bottom?  Plumbing looks great, and I love the spot you picked for the tank.     
			
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 The sump was made & runs too high - barely enough volume when return pump shuts down . Tank runs 3/4" up overflow teeth , with return pump set on speed 4 (was set to 7 & ran approx. 1" up teeth) . Whole 6" end of tank is overflow & drain was made to empty 1/2 down when turned off . 
I also had return lines set too deep in water , so that did back flow .
I did make a few adjustments , but when first turned it off ,sump filled to top , then back flowed into ato/refuge (luckily was empty) & filled 1/2 full .
Yes the bottom of the tank is blue (vinyl on outside of glass) & yes I'm leaving it bare-bottom.
Thanks