I am constantly afraid of this. The water fill tube is put on a slip over fitting which is then screwed through the wall of the tub from both ends with o-rings to hopefully prevent leaking like that. If the pump fails the tune will just act like a siphon and drain the water back into the fish tank. The pump sticks to the glass on the aquarium, so I put it way up top so if anything does happen I'll probably only (LOL) get 5 - 10 gallons of water on the floor. That still is less than ideal.
I got it set up last night. The right tub (what will be the raft system) fills up faster than it can drain into the left tub (media grow bed) so I think I need a larger drain on the sides of the tubs.
I also put a new bell siphon in the Left tub, and it does not seem to work as designed. That could be because the water is not draining into the left tub from the right tub fast enough.
Next course of action is to replace the PVC pipe tie between the tubs to a larger diameter fitting and pipe. I'll post pics of what I got so far when I get home from work.






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