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That is going to depend on the in flow of your pump. I would guess that since you're only going to be using a 30 gallon tank, your hole should be to fit a fitting nozel for a 2 inch pipe.grump299 said:That’s what I thought to but I wanted a second opinion. It is only a 30 so I will take my chances with getting it drilled and if it breaks I will replace it.
Another question if I do get it drilled what size hole do I need and can I use silicone calking to attach the corner overflow to the glass.
For a sump, I would think a 10 gallon would be sufficient since it's a third of the size of your tank. As far as silicone, regular clear 100 % silicone used to seal things like bathtubs is fine. Silicone is relatively inert once it has cured...it cannot be made soluable again and won't leach any type of chemicals or by products into the water.grump299 said:
Yes, use fish safe silicone. Any 100% silicone will work, no mold proof, or quickcure, or anything like that.grump299 said:Now with installing the overflow in the tank can I use silicone to put it in the corner or is there a special one I need to use for the fish. And what size tank should I use for the sump I’m going DIY my own so I can customize it to what I want.