I run three 2gph drip, but with pressure high I have no idea how much water they actually put out. Constant stream of water as opposed to a drip... I'll stop being lazy and test it in a 5 gallon bucket. I also do WC the really inefficient way, by adding water as I remove it. At the end of the week I really have no idea how much water I've changed. I just run it until the water has dropped like 8 to 10 degrees. 5 immature rays in a 300 gallon, they just eat a ton.
