5 months old
Nitrate 1
Phosphate 0
If you're doing anything beyond protein skimming to cause your "low nutrient situation" stop what you're doing. The tank is too new to be subjected to lots of nutrient export tools. Good algae and other beneficial critters also need those nutrients and are still struggling to get established in your tank.
Your pic kinda looks #chrysophyte-like to me. (click that tag)
@reeferfoxx has lots of posts on the topic that will help too!!
If you can get a $10 toy microscope (see:
Selecting a microscope) you could look at a sample and know almost for sure what it is. Highly recommended on general principle.....feels like a no-brainer at $10.
Troubleshooting with a blindfold on is always harder!
TO me your pic looks like a very new tank that may or may not have GFO and carbon being used on it and which has the lights on but a CUC and coral load that's near-zero or zero.
If you don't have corals, I'd probably have the lights off. If you do, then you need a lot more snails.
Only a skunk cleaner and 1 margarita. I had some turbo snails but the shrimp decided to eat them. I’m ordering more CUC next week which will be 2 Mexican turbos, 3 astraea, 4 ceriths, 6 blue leg hermits, lawnmower blenny and a tuxedo urchin
First the snails died....possibly from toxins....possibly from starvation....or a combo....then the shrimp ate them. (Or the shrimp were starving....that could also motivate them.)
Tank is too small for an urchin.
Also too small for that blenny.
Turbo's are probably too big in the long run, but good to get things under control. (Don't let them starve later on by preventing GOOD ALGAE from growing in your tank – they need it.)
Leave the hermits off the order.