I was trying to drill out the grate on the overflow in my tank to get the water level down a little while still maintaining the same flow. Well, a piece of the overflow cracked out and I have had to make a piece of acrylic to cover it for now
. My problem is, if the power fails now, my water level will go down to low and probably overflow the sump
. Does anyone know of a product that I can seal in a new piece of acrylic with, that will safely(for fish, corals, inverts) cure underwater
? Please help!!!