I think they might be coming from the pump. Its sitting in a spot in the sump where there are bubbles that i think are getting sucked up into the pump and shot out as micro bubbles in the frag tank. Are micro bubbles going to be real bad for our corals?
tamara- the acrylic was about 75 and the glue and squeeze bottle was under 20. the triangles and guitar string were real cheap as well. The only big expense was the blade for the table saw which isn't so bad since you can use it on a variety of things besides the tank. The stand and plumbing were cheap as well. 2x4's are about 1.50 a piece and pvc
fittings are usually under 50 cents. So aside from the tools i would say the whole thing was probably under 100$