Dang zoas!

[MizTanks]

No matter what I do I'm having one heck of a time keeping them alive. Except for a few. Why?
Now my Keds are being covered with red slime algae and are just about gone. RDE are thriving! My gorilla nipples are here one day and closed looking like they're melting the next. My Devils Armors where doing great, now all gone.
What the heck is going on? All other corals are doing great, as you can see from my pics

[jolson10450]

check your phosphate, ph and alkalinity levels. seems to me the algae is smothering them. try getting some cerith snails, they eat the red algae i think. also close inspect for zoa nudibranches.

[ReeferRob]

How's the flow in the tank? As our tanks mature and things grow we need to typically add more.

[Manoj's Reef]

+ 1 - algae is smothering them

Considering your chemistry is decent and there are no pests. Algae/slime/cyno/dino are the causes the zoas die.

[MizTanks]

The red slime is only on the Keds Red and just antad on the walls. New lights replaced every 6 months.All water parameters are good. Alk=9 PH=8.2 Cal=420 temp=80
Sg=1.025 salinity=35 po4 tested with API =0 nitrates=0
nitrites=0 ammonia=0
As I said it's only certain zoas. Radio active dragons eyes=wonderful green bay packers=wonderful. I'm using Chemipure Elite and Purigen. No chemicals, no dosing, fish fed dry once daily, frozen once weekly. WC once weekly 3g's. all other corals growing beautifully.

[John]

My thoughts...

Nitrates : 0

Red Slime = nitrate issue/flow issues/ ended light cycle

I would try a different test kit.

Also, seeing as you are in the U.P. I'm wondering if you are using RODI, the water up there tends to have more minerals than the treated city water down here... that is if you are using well water.

Also, what is your waters TDS at?

Have you had any adjustments in lighting or flow recently?

EDIT: Also, if you are doing a 3 gallon water change on a 8 gallon tank, that is a bit too much. IMO. You way want to go to 1 gallon water changes.

[MizTanks]

Yup I just replaced the lights. Will lower # of gallons per WC.

[adalius]

Plus bear in mind that if you have algae/cyano growing, there's nitrates, your test kit might still read 0 because it's reading what's left in the water after the algae have already gotten their fill, which also means your test kit isn't defective or anything. Still wouldn't hurt to double check with the LFS's test kit, or another if you have one lying around that isn't expired.

[MizTanks]

Dang it all to heck!! Now my GBP's are looking like crap, and another smaller colony of some unnamed ones is getting smaller. I've increased my flow with a nano 250gph. Running it only at night from 8pm til 10am due to the amount of flow it produces. Still the RS persists. I'm going to do Chemiclean.
I don't have a TDS meter so I cannot check for it. I've up'd my WC's to 2x weekly 1g per change. I don't know what else I can do. I've never been able to keep zoas alive, and have just lost to many to continue trying. Thing is, they are my favorite coral (

[jolson10450]

Dang it all to heck!! Now my GBP's are looking like crap, and another smaller colony of some unnamed ones is getting smaller. I've increased my flow with a nano 250gph. Running it only at night from 8pm til 10am due to the amount of flow it produces. Still the RS persists. I'm going to do Chemiclean.
I don't have a TDS meter so I cannot check for it. I've up'd my WC's to 2x weekly 1g per change. I don't know what else I can do. I've never been able to keep zoas alive, and have just lost to many to continue trying. Thing is, they are my favorite coral (

keep a red flashlight and look at the tank at night. you may have a zoo eating nudi in the tank that is why none ever grow. you should have at least some that flourish at least. only other thing i can think of is bad prameters but you are doing water changes regularly, or bad bulbs but all of your other coral are doing fine.