Great Growth/Color in some bad in others

[Xenia_Princess]

I have had this issue all year, some corals are blowing up with growth others look great but don't have any growth.

Alk 7-8
cal 350-400
ph 8-8.3
mag 1400-1500
salinity 1.25
nitrates 0
phos 0 on any test

3x400watt Lumatek with Reeflux 20k

I dose microbacter and biofuel to keep nutrients down

The only thing I can come up with is possible alk swings, and just not enough nutrients, I have about 8 fish in a 220 and 75 gallon sump.

My ORA's grow pretty nicely, Just lost 2 new ORA additions I am pointing to to high of light right off the bat...

Mushrooms/zoas do not grow(nutrients im assuming)

Green Montis such as spongedus have huge brown polyps so you can't even see that base, have tried moving them all over with no avail to changes in color or polyp extention.

Water changes about 1 time a month(downfall)

 

[jarrett shark]

Change water every 2 weeks and then see what happens

 

[allsps40]

Are you dosing a carbon source along with the bacteria to have a ULNS? If not then there is no need to dose bacteria. What salt do you use? Most salts even "reef salts" are low in needed trace elements for colors. Such as iodine, potassium, strontium even mag. I used Reef Crystals and have coloration problem due to low potassium and iodine. Pro Reef and DD are great salts to use for color. Pro Reef worked great for me but is pricy and hard to find. RC is easy to get and cheap so I was giving it a try. What I am getting at is are you doing anything at all to the tank other than what you mentioned?

 

[Xenia_Princess]

will try to stay on top of the water changes

Not sure what ULNS is but I just dose Reef Biofuel and Microbacter...I use tropic marin atm.

I only dose 2 part, magnesium, bio fuel, microbacter, I also use some reef snow, and other coral foods every once in a while. I do not feed the fish every day either.

 

[allsps40]

Ultra low nutrient system=ULNS. Yeah try to do more water changes that will help replenish what is used up by the corals.

 

[Xenia_Princess]

Also I have a DSB

 

[Xenia_Princess]

forgot one probably major detail I also run carbon and change it out bi weekly