This may not be the most complicated DIY, but I have 20 gallon over the tank fuge and was having circulation issues because the cheato and such have grown so large.
Added one Right angle and 2" of straight PVC to the inside through hole and turned it into a Carlson Siphon surge. It's surging ~ 5 gallons into my 30 gallon tank ... the fuge has been full of pods, so hopefully a good transfer to the main tank without losing the breeding stock.
Added one Right angle and 2" of straight PVC to the inside through hole and turned it into a Carlson Siphon surge. It's surging ~ 5 gallons into my 30 gallon tank ... the fuge has been full of pods, so hopefully a good transfer to the main tank without losing the breeding stock.