coral growth problems please help

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arafas

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Hi, i need some help in regards of coral growth. I been in this hobby 10 years but fish only and now i am starting to add some corals but having issues.

setup: 90 gal tank, 30 gal sump, reef octopus 150, 7 inch filter socks, AI 26HD LED light
Alk: 9.8dKH
Calc :480
Mag:~1400
salinity: 1.026
ph: ~8.0
ammonia: 0ppm
nitrite: 0ppm
nitrate: 16ppm
phosphate: 0.08ppm

everything is checked with red sea testers. Lately i been doing 25-30 gal water change every week vacuuming the sand, change my socks once a week 25micron.

fish:
yellow tang
sail fin tang (10 years old)
wrasse
diamond gobby
I fee pellets and some frozen food once a day or super small 3 times a day. Fish are always happy no problem.

corals(frags): blasto, waving hand polyps, green slimer, bam bam zoas, yumas
green slimer was green now all white with little polyps, blasto died but two are growing from the side very slow, zoas nothing, waving hands growing a little, yumas dont look to good, i just recently realized my temp in the water was to high so I adjusted back to normal and yumas look like crap, they loved 87 degree water temp, don ask me why temps where so high(point of sale digital therm). Can you suggest anything that i am doing wrong.

light: ai 26hd LED
UV:37
V:60
RB:70
B:67
G:15
R:12
W:35

Running GFO and Carbon in reactor, def have some algae on the glass and rocks but not hairy just dark green algae on rock also a lot of coralline algae.
Please help stuck :(
 
Water temp isn't the problem (I don't think). Mine ranges daily between 81-82 with similar corals. You haven plenty of flow throughout? Green slime in high flow high light? Feeding Blasto's chunky foods ?
 
yes a lot of flow, 3 big power heads. blasto the main coral is gone so can't really feed chunky stuff, waiting until the little once grow, green slimer had him high moved him down thought maybe the light is killing him
 

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