I have 4 fish (2 clowns, yellow watchmen, and a pj car.) also have a pistol shrimp and a peppermint shrimp. Hard to tell how many lbs of LR but im guessing 25. The tank is not a new setup. It's been running for over 2 years now. I just moved it from my brothers place to mine now that I have my own house. The flows ok but I'm going to be adding a seio M820 along with my 2 K1. Might leave out the K1 but I'll have to see how strong the Seio is.