Hi all - this is an older thread, but still great info! Much appreciation to Oscar for bringing this simple and superior vortex build to life.
I've just picked up one of these 15 gallon tanks, but mine has the 1.5" drain on it (not the 2"). It's too much hassle to return so I'm hoping this will work. My question is, should I just go with all 1.5" PVC or use an adapter for the drain to accept 2" and go that size all the way? I have an AP-100 on order so there will be tons of power (maybe too much if I go 1.5?"). Would like to go with the 2" size but if the drain causes too much of a bottleneck, maybe the 1.5 will be sufficient?