Hey all. The tank in question is a Juwel Rio 125. 125litres 1200lph flow in total, supplied by juwel internal filter and Supafish Aqua external. 4x18W T8 (Osram Lumilux 880 Skywhite + Osram Lumilux 840) ADA Aqua Soil Malaya TPN+ 5ml per day. Pressurized CO2, 1 bps, drop checker is green, diffuser is a Rhinox 2000. Water changes, 32% weekly. I'm still getting algae though and I can't figure it out. I've got BGA spreading along the gravel at the front,, fuzzy algae on the wood (which I don't actually mind), short thread like algae on the plants and some algae on the glass. All of these would indicate, low/unstable CO2, low flow and low nutrients. However, judging by what I've got in terms of equipment and maintenance, I don't see how that's possible. Arenâ€™t I doing everything right? Any guidance as to what I'm doing wrong? I don't want this tank over run again I've supplied pictures to help you get an idea of the tank and the algae. There is lots of H.polysperma on the right. Anubias on the rocks. Pogostemon H near the front. Java fern on the left. Vallisneria nana at the back.