Ok so as my mind overflows with new info and knowledge I keep coming up with questions so I apologize .....
Regarding side drilled holes for overflows here are my overflow box choices and I'd like to use the Bean Animal overflow method.
1.) Eshopps Eclipse Large @ 16" that does 1000 gph
2.) Shadow Overflow 16" which is 2500 gph
3.) Ghost Overflow @ 18" which does 2000 gph
I guess my next question is since I'm only drilling on one side of the tank and I have an 18" width to work for can I still wo with the 18" Ghost overflow or only the 16" boxes? My other question is where do I put the returns if the boxes are in the way or how would I pipe them in and how large do those holes need to be?
Thanks!
Because you also need to have the return on that end of the tank, I would go with one of the 16" versions. You want to leave a MINIMUM 1'" between the edge of the glass and your hole for the return, 2" would be prefered, but it doesn't sound like that would be an option.
It sounds like a better option might be to custom build an overflow box. You can do this with either glass or acrylic. You should be able to find a TON of info on building an oveflow box. Its pretty straight forward really. I would build it about 12-13" to leave room for the return. The overflow would just need to be two sides and a bottom, which would then be siliconed to the tank. You would drill the three drain holes in the tank behind the overflow, and the return line to the side, up high to reduce the water siphones through it when power goes out. I recommend 1" for the drains and 3/4" for the return. Just make sure the box is large enough for you to fit all three drains in and is easy for you to access.