Tank Glass "Bow'ing"

[mike31154]

I take it the tank has no center brace then? If so, and if the tank is a brand name product (not dyi) then it's probably designed that way (no brace) and nothing to be concerned about. I purchased my 75 (Hagen, 3/8 inch glass) second hand and it came without a center brace. When I started considering building a canopy for it, I noticed it bowed considerably at the center. Pretty difficult to fit a square canopy on to a bowed tank. I haven't put a canopy on it since I'll be replacing it with a 90, but I did make a wooden center brace for it to remove the bowing effect. I guess I'm saying that if my Hagen 75 is designed without a center brace, your 30 is fine without it also.