It may be regular hair algae, which feeds on phosphate, or bryopsis, which looks much the same except that it develops in strings and plumes. Bryopsis can be fought with a preparation called Reefflux, but the simplest and likeliest in a new tank is hair, which can be handled via phosphate uptake. The lack of phosphate may be due to it all being IN the algae, and more slowly released by rock and sand, which often contain it. I'd try the phosphate reduction first.
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Sk8r
Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.
Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.
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