Battling... something, help ID plz

[Brian1f1]

Hello all,
Sorry to have another ID thread. I thought that I’ve been battling low grade dinos for a couple weeks, now I’m not so sure. Seemed to “bloom” when I didn’t realize my ato with kalk ran out for a several days (big system, didn’t notice). This probably caused Alk and salinity to vary. The system also dropped in temp from 76 to between 73 and 74 around the same time (not enough watts, corrected).

Stringy brown strands. Bubbles. On the sand and rocks and very badly on my Chaeto in the fuge. Strings seem to aggregate on a few certain corals multiple times a day and rarely or never

on others. Seems to really stick to one anacropora and toad stool corals and not much else. Was convinced it was dinos but realized my fangs seem to happily eat it, and no snails have died. Guess I should get a micro scope. Been trying to correct by amping the nutrients, cranking up alk, running more blues, and basting the sand bed... I’d say it’s modestly improved but not curing. Maybe it’s no dinos. Is there anything else that meets what I described?

A few pics of the sand bed. The tang munching on it. I blasted the sand last night. The coral had been cleared a half hour ago. Again it seems to really only stick to that and a few others and my chaeto. Thoughts?

 

[Flippers4pups]

Need water pramameters.

 

[Brian1f1]

Ordering more precise equipment hopefully tomorrow. Have only API. Best I can tell low but not no nitrate (less than ten, more than 0) and some level of phosphate, maybe kind of high (crapshoot with api, never had to an issue where I needed to know it in 16 years, first time for everything!) :/