Homebrew PCBs

I'm also using two "small bubble" makers on a dual outlet pump, but 
haven't had a chance to get much tank use yet. They're the kind with 
the "fuzzy" looking textured surface. They did put off a nice strong 
mist of bubble fizz, which was spread evenly across a vertically 
hanging double sided board, so I think they'll do OK. It was strong 
enough that if they were too close to the surface, it would produce an 
airborne mist (eventually I'll mount them to the base).

I looked at a standard tube with holes first, but chose these. I 
wonder if you could just drill up a tube for it. I thought about 
making a plexi rectangle with some type of standoffs to create a 
vented chamber in the bottom of the tank, and gluing my tubes through 
the tank's sides near the bottom, but figured it might be a hassle 
while filling the tank and waiting for the etchant to fill the chamber 
(or having the air try to lift it out). 

The bubblers seem like a good area for DIY. With economy heaters and 
pumps, they were almost as expensive as some of the important stuff.

-George