Mikeyboy's old 215 - BOTTOM is DEFINATELY TEMPERED!!

[brewercm]

Are the holes actually part of the mold basically. Maybe not a mold that they use but just putting into laymans terms.

[GaryP]

You got me on that one. That would explain part of the cost of Oceanic tanks though. It would be custom glass from the manufacturer.

[Bill S]

No, actually it's pretty simple. The holes are drilled at Oceanic. They have a tempering oven that they then put the glass into to temper it - it can be done at any time, not just at the manufacturing stage. Tempering and annealing isn't THAT difficult, once you have the equipment in place (annealing is the opposite of tempering). It's all a matter of consistent temperature control. At one time in a prior life I worked for a big steel/aluminum company...

[Bill S]

Gary, et al,

If I go with the calfo, how do I determine what level to glue the overflow line on the calfo box? How big dimensionally does the box need to be (like 3" x 3")?

Does 3 or 4 1-1/2" holes sound ok, or should they/could they be 1-1/4 or 1"?

[Bill S]

OK, I guess I'm on my own.

Well, I've done a bunch of research - and everything I've read says the more/bigger the holes, the better - for cutting down on noise. So, I'm thinking of 4 1-1/2" holes. I'll put the weir at the same height as the overflow on the old ones from Oceanic. Hope it works.

Anyone have a good source of glass for my calfo?

[LoneStar]

Samuels might be able to help you out on glass.

[GaryP]

I have two 36" holes drilled for my calfo. That should give me 2 X 2" drains after the bulkheads go in. This is for a 5 foot long calfo. Location depends on where you want the water level to be. A calfo usually doesn't have teeth on it like a regular overflow to provide a thinner layer of water skimming. Snails or other "chunky" things shouldn't be a problem for drains as larger as you are talking about, but you might want to consider what you are going to use as a screen on the calfo. Pete or Dan can probably help you out there. They both built calfos for their tanks and build them for others.

[Bill S]

Gary, 36" HOLES? How BIG is that tank! Seriously, thanks for the info. Maybe I'll get Pete or Dan to just build mine for me. I sure don't mind spending the $$. I have Pete's email address, but don't have Dan's.

[GaryP]

Opps, sorry, I meant 3" holes.

[MrZ2u]

Why not run it shallow and the full length of both sides...then bring the trim on the top down to cover it?