SPS issues

[wazupjames]

I am starting to keep some SPS. In the past I have only kept Softies and LPS. Anyway I was hoping to get a little help. I have some doing great and others not so great. Pink Hydrophora, Green Slimer, ORA Frogskin, ORA Green Damicornis, ORA Brett's Purple Rim Cap, ORA Green Cap, Idaho grape Monti, Pink Birdsnest, Red monti cap are all doing great.

4 ORA Red Planets, 2 flower petal monti cap, Sunset Montipora, Poker Star Montipora, 2 ORA Hawkins Encinata, Bali Tricolor are all not doing so great.
They all have polyp extension throughout the coral but are either browning out or turning white (bleaching). But they still have full polyp extension. I am not sure what to do about these. Even the parts that look to be bleaching have full polyp extension.

Does anyone have any advice?

Tank perams
Nitrate - 2.5
Phos - 0
Ammonia - 0
Nitrite - 0
Salinity - 1.026
Temp - 78.5
Calcium - 400
Mag - 1320

Coral are under 250w MH. Everything else in the tank is great all my softies, LPS and clams.

 

[Felixc395]

Considering you said browning and bleaching, I'd turn to parameters. They may not show up if you have algae, but you may have some nitrate and phosphate problems. What type of test kit do you have?

 

[fishguy597]

What is your dkh? How long have you had the sps in your tank? You may want to check for pests like aefw or red bugs.

 

[twon8]

i would run some carbon and up the flow

 

[bigdog69]

how long has this tank been running

 

[tike]

What dimensions are your tank? How old is the MH bulb? Where heightwise are the said corals positoned? What do you have for flow? Type skimmer used? This will help us all help you find the answer Hopefully!