Monti good growth but brown, Acro colorful but no growth

[Surykor]

Hi all
I picked some SPS frags from friend some of them decimated my camelback shrimp before i even noticed what the hell is going on. Shrimp is now gone so what remains is little green unnamed acro frag , stylo frag and monti confusa frag.

Monti overgrowing its base rock nicely but faded almost all of its green to brown. only tips and new growth areas have little green.

On the other hand, Acro is nice bright green but with no signs of growth. added only some polyps on sides

Stylo frag is still regenerating from shrimp attack- some new tissue and polyps came back. I keep it at middle of tank in good flow.

Frags are in tank about 3 months
Can somebody make some advices please? nutrients? light?

setup 35G 6 months old (still skimmerless delaer is not able to get it :furious: )
120W T5 ATI - I know not much light but frags are right under the water surface with very good flow
Dosing kalkwasser because Co2 and low end PH .pretty common huh?
trying prodibio reefbooster for 3 weeks now

Almost forgot. Keeping only 4 small fishes and cleaner shrimp + snails so far

Phosphates -undetectable - got more than usual algae growth on rocks so I changed GFO yesterday, However hand to hand with algae growth, zoanthids started to make new heads rapidly. so it seems that they like some not close to zero values of phos
No3 - around 1ppm (salifert)
alkalinity rock stable 9,3 DKH (salifert)
SG 1,025-1,026
weekly 10% WC with RS coral pro

sorry for poor english I dont visit school anymore
Thanks in advance. Sury

 

[Art13]

I would guess the monti isn't getting enough light, usually thats the cause of the brown out. Give the acro some time. Judging by the algae there may be other issues.

 

[gar732]

I'd say its po4. You have quite a bit of nuisance algae that is probably absorbing the po4 and giving you a false reading. How many fish in your tank? Any other form of nutrient export besides the gfo? What skimmer are you waiting for?

 

[Surykor]

Thx guys,
4 small fishes and cleaner shrimp. Feding 1\2 of frozen every day.
Well gar732 this is exactly what I think- false zero because algae growth masks it.
nutrient export- external filter maintained every week and WC. Waiting for hydor slim skim. Not available in eu for maybe 2 months from italy. Now trying german dealers..