everytime we look at your tank Renato I like to tread carefully and brag on your corals ability to vastly exceed mine in every way possible
this is a very low nutrient setting tank, lends credence still towards hand scraping, and lowered lights for a while to get control again. To nutrient dealers, it will indicate stripping po4 lower than the earths mantle and starve it and walk the line with corals who weren't used to that.
That sandbed doesn't look rotten, your live rock looks unplugged just like mine below, the source for your minor microalgae is the nutrient upwelling, new variables and bright lighting. A UV would be so very impactful Sir used in this way:
amazon has 30 day return guarantee, check your shippers and restocking rules. I claim cleaning out those walls with a razor, not casting the strips of algae into the tank but indeed removing them with each upward pass, will make your walls clean. you then install a UV so grossly oversized its not even matched to your tank, drop the lighting a bit for a couple week. algae doesn't come back. try to unhook it by day 20 and decide if you liked the effects, this has been done more times than I can count.
naturally that's kind of a hassle to do, but its a really strong contender based on your tank shots that's for sure. there are no obvious sinks here.
How to stop microalgae has a few different options, I point out what I think works best and what Id do if I could afford corals half that nice.
People will chime in lots of options besides my
amazon rental idea lol, but that would have never been posed at all had we not discussed its awesomeness that's for sure. the lighting is simply working against you at its current full on rate, although corals sure aren't minding.
The uv wouldn't be permanent, it would be an arrestor. This micro algae phase is common and expected not atypical
well done in not letting this get into the rocks and become a permanent pump of the invader. you were hands on from the start.
)
