Question about my overflow

reefkeeper135

Premium Member
OK so my tank has a single corner overflow and has seemed to be adjusted right as the water level in the overflow was about an inch lower than display. It would fluxuate a little once in a while but today I notice that the water level is equal to the main tank, and the water level in the main tank seems to be higher as well.

Any idea what might cause this change? I did "T" into the return line this weekend to add a UV sterilizer the "T" runs to the sterilizer and I used a ball valve to control flow rate thru sterilizer. I dont see how that could cause this but not sure what else it could be. Any ideas???
 
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