Internal overflow

[Andrew_B]

I'm looking at adding an internal overflow to my existing tank as my current pvc/strainer isnt stable enough. The strainer clogs easily and the water levels rise/lower often. How difficult would it be to install an internal overflow on a running tank? Obviously I'd have to lower the water level so that I can work on it but does the glass need to be 100% dry? Is there any sanding involved to make it so silicone can adhere better?

[fshfrk]

Dry yes. Sanding No. You will need for the water level to be below the fresh silicone for 24 hours so it can dry. If it's a w/d, run a small pump from your sump so your media stays wet and your bacteria does not die.