The volume of the medium caused the cycle time to go from 15 min to 3 min. The siphon is still working nicely but not if I cut the fill speed. My thought now is that this test GB is just too small. The FT has 25 gallons of water and the GB fits 9 gallons minus the medium up to the fill line. ( 15" x 19" x 7" )-ish. You can see it bulges out so it's not exact. Going to consider building a 24" x 24" GB which is 17 gallons but then I'd probably need a bigger FT so it doesn't leave the fish in on any a few inches of water during cycle. .
I probably should just start with a full size version which I'm currently thinking will be 3'x5' with an FT big enough for 2 more GBs.
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