Eric, you may look at getting a test kit for iron. I had problem after problem with getting my chaeto to grow (when I had it) and did all kinds of research to find out that my iron was really low. Once I dosed iron a few times my chaeto took off.
Yeah had very little bubbles as well. I may do the same with the 16 as well. I rounded the top edge over with a router then flame polished all the edges. I sanded all the pieces with 220 grit to smooth out the cut marks.
Thanks Guys!