problems with millaporas

[Amadod2]

So the last month i been noticing most of my millaporas aren't doing so well, the water is great, calcium 400, alk 9.4, mag 1400, and phosphates .04.

i have no idea whats going on with with…do any of you recommend anything??? i dont want to lose them, even though they are all 1"-2" frags

[MitchM]

Can you tell us what you have for lighting and water flow?
Maybe post a picture of your system?
Were the frags already healing on the plugs, or were they freshly cut?

[Spyd]

Lots of light and high flow is essential. Are they browning out, bleaching, STN'ing?

Millis are pretty tolerant compared to most acros.

[reefwars]

Alkalinity swings seemed to do a number On mine

[Aquattro]

Can we assume you have other acropora that are all doing well?

[Amadod2]

i have a 6bulb ho t5 fixture, vertex doser, swc protein skimmer, tunze jabao and korelia powerheads,

[MitchM]

More information please.

Tank size, how many/which powerheads, describe how the corals are not doing well, are there other corals in the tank, are you using carbon, where are the corals located, have there been any incidents that would have affected them...ect

It's hard to recommend a possible solution without knowing details about your setup.

[Amadod2]

Tank size 75g , 3 powerheads jebao wp40, tunze 6065 and a korelia1150, the other corals are doing well i will post some pics. im not using carbon, only rowaphose, and the corals are located mid tank, i started my tank in august and my first water change was done in december, but the millaporas were ok, i also was using tap water for top offs, now im doing water changes every month 15% and using RODI water for everything

[MitchM]

Your lighting is good, your flow is possibly sufficient, depends on how you have it arranged.
More water flow would be good. Flow is more important than lighting for corals.

I would be concerned that maybe you have some alleopathy (chemical warfare) going on, and with very few water changes plus no carbon, any new corals will have a hard time adapting.
Rowaphos can be hard on sps if you're using too much. How much are you using, and have you always used it?
The pictures might help a bit more.

[Amadod2]

i been using it for three months or so, i never used carbon, is it better??