Thank you for posting that is such a perfect candidate for our thread, perfect. It’s a small, fully accessible system which makes for quick work compared to large systems
This is how to fix that system up:
Take out rocks and set them aside
Catch any fish and shrimp hold elsewhere
Take out removable corals if any, hold elsewhere in saltwater awaiting put back
Now the tank can be totally emptied. If you want to keep your coralline spotting cuz it adds an aged look then leave it on the glass. If not, lay a paper towel soaked in vinegar across it a few minutes while drained for cleaning. It will melt off, depends on how clean you want the reassembly to look.
We never treat just the algae or the cyano here, we actually treat it last in the process. The #1 goal for this tank is taking the tank fully apart, rinsing out any sand if applicable before re use, then cleaning off rocks, replacing all the water as well. Then re acclimate animals back in, there must be no clouding in the tank whatsoever upon rebuild. This is how we avoid a mini cycle upon setting back up, detritus clouding causes the mini cycle, not the action of cleaning the tank. Our sand rinse thread has many working examples of full part cleaning / can be studied ahead of time but that above is the process. You are guiding out phosphate and nitrate imbalances by taking all the detritus out immediately, at once. Putting back only rinsed rocks (rocks are rinsed in new saltwater) and rinsed sand if any.
Your phosphates are then totally reset as they should be, in balance, due to the full approach vs the partial one in most threads. Your tank will shine and it won’t recycle, it just moves on looking great. I recommend cleaning the glass walls of coralline but leaving it on the back wall it looks good
https://www.reef2reef.com/threads/t...ead-aka-one-against-many.230281/#post-2681445
We wouldn’t use any medications, chemi clean, peroxide or nutrient testing for this particular restore, I’ve seen five hundred examples just like this one and they all turn out the same if you clean them fully like the example threads show- thanks tons for posting we want these examples. An example of a tank similar to your is on page 12 or so, an excellent video of blast rinsing is provided plus follow ups. Last page has good follow ups long after cleaning
The key to algae control in a nano is to match your treatment specifically to the invader. Yours seems to be a minor accumulation/aging issue, oil change time that’s all, no harm. Nothing to rasp off, rinsing will work here
Rooted and anchored invaders need a test rock + an algae kill step so growback stops, to allow for coralline takeover. Cyano is easily just fully rinsed out
We always take small tanks apart to clean them vs just treating surfaces, because the clouding in the system is the feed for the invader, on the rocks, and to clean properly is the real way to win.
Matted invaders, unanchored ones like mild cyano infestations respond well with no chemical cheats and mere manual cleaning top to bottom.