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Re: [APD] Re: Aquatic-Plants Digest, Vol 7, Issue 26

Adding a bulkhead works fine if you have an acrylic tank, those who have glass 
aquariums... particularly tempered glass tanks, cannot (or rather SHOULD not) 
drill holes. Drilling in glass is a big gamble. Yes it might look fine, but 
the drilling process causes tiny fractures in the glass (probably not 
visible). It left undisturbed, it might last beyond your lifetime, it might 
last 10 years, it might last a month. IMHO I don't think it's worth the 
risk... 120 gallons of water is a LOT of water, especially when on your floor. 
If you figure MOST peoples sumps only hold a few gallons of water in them, the 
worst thing that can happen if your siphon fails is those few gallons will 
overflow onto the floor and you will probably burn up a pump. Yes a few 
gallons is still terrible, but if the integrity of your tank fails, you end up 
with much more water and you lose everything, not just a pump.

Quoting BAshcraft at BrashearLP_com:

> > Date: Tue, 9 Mar 2004 06:42:14 -0800 (PST)
> > From: Rod Gerrymander <rgerrymander at yahoo_com>
> > Subject: [APD] How do I avoid bubbles in siphons?
> > 
> > My problem is that there is pearling going on in these
> > tanks 24 hours a day somewhere and the siphons are
> > getting bubbles in them which tend to collect at the
> > highest point, with disatrous consequences if left
> > untreated.  I need a system that can go without 
> > maintenance a minimum of three weeks, and this is not
> > going to make it.
> > 
> > I tried putting 90 degree U curves in the bottom of
> > the siphons so that rising bubbles would not enter
> > them
> > and this was surprizingly uneffective.  With all the
> > oxygen plus co2 in the water I'm not sure what these
> > bubbles are, but they may even be rising spontaneously
> > inside the tubing.
> > 
> > Does anybody have a suggestion for keeping these
> > siphons flowing?
> > 
> > Thanks,
> > Rod
> The only way to make siphons foolproof is to remove them.
> It's actually quite easy to drill the tanks and install bulkheads for 
> overflows.  I did it for the first time a few months ago, and have done 
> several other tanks since then.
> But, even bulkheads aren't 100% foolproof, especially in a planted tank 
> since leaves can clog them, but they're about 1000% better than siphons.
> Bob Ashcraft
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