I know what a hob overflow is. U aren't getting it. I mean I would run hob skimmer, and hob filters, or drill the tank. No way I'm relying on a single siphon to carry water over the edge of my tank and put it in the sump. I personally don't understand what the cost of your house has to do with anything, or what your drilled tank has to do with anything. Nobody wants water on their floor period. It's great that yours hasn't failed. But the Fact is, it's still a risk. I ran a bean animal for years. And the siphon drain got clogged on more than one occasion due to snails or algae die off, but it didn't matter because there were 2 backup drains to handle it. Where is your backup?