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My 140 had three 1 1/2" bulkheads for a closed loop. The tank builder bought the wrong hole saw for the bulkheads and ended up shaving them down to make them fit the holes. Needless to say a year later the nuts popped on all three and one started to drip.
Luckily I had put them in with Dow Corning 795 sealant as well or they would have leaked quite drastically -- all three bulkheads were barely holding in.
I ended up sealing over the 3 bulkhead holes with larger 3/8" glass pieces siliconed over the holes. I had to tear down my entire tank to do this and ended up losing some livestock as a result.
Sure it was the builder's fault, but it was still a pain.
I went with tunzes now and I've never looked back. Less heat, MUCH less power.
Tyler
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