I just up graded to a aquaclear 500gph 3 days ago it works really good the one pictured was 250gph. I really don't like sumps/fuge they are expencive and they are really noisy. Its a 40 gallon, hob aquaclear 500, hob corlife skimmer, and 2 power heads. All the rocks half way up are dry rock and I drilled like 10 holes in each to mount plugs. They fit snug no puddy or glue. Been using purple up for 1 month and it is the bomb lots of new coraline poping up all over the rocks and back glass