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Old 04-26-2006, 08:26 AM   #11
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If the bottom isn't tempered, a hole or two won't hurt anything. (Assuming it's done properly.) The ultimate would be a tank that was drilled before assembly, and the glass tempered with the holes in it.

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Old 04-26-2006, 05:37 PM   #12
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I use a CPR overflow w/ no problems at all. If you do use a CPR overflow(s) don't use the air pump they recommend to maintain/restart the siphon. A maxi-jet 1200 ph works much better. I've never had a failure using one. If the sump, return plumbing, and overflow are set up correctly floods will not occur whether the return pump and/or overflow fail for any reason. One thing that helped me when building my sump was LxWxH(in inches)/231=Volume in gals. Also this site is a great reference for sump designs etc.- www.melevsreef.com/allmysumps.html
Good luck!

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