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Tank has been there for years, I just recently noticed it had no filter. They said it gets cleaned alot, I also remember 1 time when the fish were gone and they said they were sick. Anyway I can't imagine he's had it running for years with no filter and all the fish are still alive. I'll ask...

My dentist has a large hex tank maybe 90-120 gallon. Looking closly at it, I saw no filter other than a couple of bubble stones hanging. I asumed it's an undergravel filter but non of the lift tubes have power heads or air stones. The gravel is was mostly bits n peices of shells about 3-4...