Received and installed on Saturday and so far seems to be working ok. Removed filter floss and GFO from canister filter but left it running with a bit of carbon and for the added flow. I bought a wire brush from Home Depot to scrape the rock hoping it would work better than a toothbrush. Big mistake!!! All the bristles from the cheap ass Chinese brush starting falling out. Spent a half hour just picking them out of the rock. I seeded the screen with some of the algae by just kind of smearing it onto it. Anyone else using the HOG.5?