Sounds like the poor guy had nothing but troubles with this tank. To quote from his post....
"At this time I am having problems with my steel above the water line rusting. I built 10 access doors to feed the fish etc. and they are rusting also. I had problems with the floor above the tank after the first year because the floor materials absorbed water and weakened. I then had to replace the floor. I heat my tank with a house oil fired hot water tank. I have used 2 swimming pool heaters before this. But I had many problems 1. the first one ran great for 5 years but it had been installed improperly by the seller and caused a fire. The second one was far too big and it started leaking in the boiler after 1 and a half years."
Plus he does 10,000g water changes weekly...
"I use a 600 lb sand filter on the mega tank, the natural lava rock filtration, I don't over feed and I do about 10,000 gallon water changes every week."
I'd be happy with a 300g, but that's never going to happen, so I'd better dream on
