This forum has been helpful so thank you all in advance. I recently installed an DIY ATS on my 80g system. It’s been up and running for ~4 weeks with very limited growth. 6”x10-12” screen(the length is a logistical choice based on keeping noise down and having it end just under the surface into the refugium(rock rubble)) I just figured the more screen the better even if the lights cannot cover the whole surface. the lights are 10w violet spectrum amazon jobs. https://www.amazon.com/dp/B07G98ZW7X/ref=cm_sw_r_cp_api_i_5MO6Eb39W13ME They’re suspended over the top of the screen via an egg crate connection and I balance them on the slot pipe(not ideal but works well for my very tight space) they’re about 2” from the surface of the screen. do these seem sufficient? Do I need more wattage? Less? Further or closer to the screen? It’s a simple u PVC bend off of my manifold. I was following the old threads and cleaning it completely with fresh water spray in my sink every 7 days. I get what I would call superficial growth but not anything like the hair traps I’m seeing here. (Funny that I’m now encouraging GHA after all the struggles I’ve had with it in the past) today I did a lot of reading here and made a few adjustments. Saran Wrap over the waterfall so I can increase flow without spray. I only have a green tinted Saran Wrap, is this ok? Regardless I’ll get clear as soon as possible. I put a square of tape over the hot spot on each of my lights because I noticed a slight “growth ring” (IE lighter or less growth in the center) reduced my lighting from 18 hours to 12 (is this right for an immature screen?) my main question is about flow, how does one calculate flow levels? As mine is running off of the manifold and not a GPH rated pump I have no idea where I’m at. There’s a ball valve that I can use to adjust it but if it’s at full blast the water just sprays everywhere. Thus the Saran Wrap, but it’s still enough flow to I tried placing a small tub under it and timing it’s time to fill measure the amount and multiplying but the problem is it’s a very rough estimate. The only thing that would fit is a very small tub. Maybe 16-25oz total? Im now On day 11 of growth and not much has changed since maybe day 4. It looks like hair algae but it stays very short/superficial with a few spots of brown or even reddish growth(pea sized) possibly cyano? I “seeded” it with a few grams of GHA from my tank via balling it up and skewering it to the screen with a tooth pick. And the gha is still there after 4 days and removing the toothpick just now because of the Saran Wrap. 80g total system size 1.025 79F Nitrates at 10ppm Phosphates .01 Semi-weekly 15 gallon water changes so give me some constructive input. What am I doing wrong?