I can't keep zoas!

Floating hydrometers are notoriously inaccurate unfortunately, unless your LFS is using a calibrated refractometer they could just be verifying the same incorrect measurement...

i do notice the tiny air bubbles that attach to the float, i introduce water as slow as possible to reduce this. my LFS does use a refractometer and usually calibrates it before checking my salinity.
 
grabbed a ro/di unit and refractometer tonight.

polyps are in the same condition but I will mix some water and do a water change tmw.
 
RO/DI water... also, I have polyps growing in the shadows of my PC lit BioCube... your lighting may be an issue. Put them in the shade and see if they like that more.
 
It takes time for things to change in a reef tank, are they doing any better? At night do you see anything on the polyps eating them? Do you have other corals in your tank and are they doing good? Do you add supplements to your tank and not measure to see what their levels are?

I wouldn't trust your local fish store, you should try and find another one around your area. They have given you a lot of incorrect information. When I am looking at a new fish store I look to see if they have a display tank that looks good with nice big colonies of corals. If they do that shows that someone in the store knows what they are doing. I also look to see if they have many dead fish in the tanks. I know that sometimes things happen and a fish will die but it is good to see that the employees will take the dead fish out of the tanks.
 
It seems like they're doing a little better. I do add supplements but I have the water checked once a week to be sure.

I pulled one of my old powerheads to replace it with a newer Koralia unit and I found a bunch of very very tiny bugs crawling all over the bottom of the powerhead.

I took apart my old salt mixing drum to start over fresh with my ro/di water. I found a grayish coating of hard grainy stuff on my heater and sediment on the bottom of the drum which is probably whats killing my coral.
 
this is what i'm talking about:

IMG_20110320_173019.jpg


Also found these in my filter bag:

IMG_20110320_212051.jpg
 
The stuff at the bottom of the drum is just salt. More flow can't hurt, just make sure the power head isn't blowing the polyps off of the rock. The problem with you saying "I do add supplements but I have the water checked once a week to be sure" is that if your the store that tests your water is the that told you to change all your bulbs at once I would have a hard time believing them. You shouldn't really be adding any supplements like Cal Alk or Mag to your tank unless you personally can check them or if you have a trusted store that can test for you. I have a LFS that I had check my water and they did all the test in less than 2 minutes and there is no way what he told me could be true because they are using the test that you add drops of stuff to the water and check what color it is. You can't trust everything that the employees say because they are there to just make money, so if one of your fish or coral die they don't care because they think you will just come back and get a replacement.
 
The red things are bristle worms and they are no harm, they eat left over food and keep your tank clean.
 
The red things are bristle worms and they are no harm, they eat left over food and keep your tank clean.

Haha, after all of the talk on here, I know what you're saying. Do my own tests, figure out my own diagnosis and STICK TO THIS SITE rather than going to the LFS.

I hope you're right because I tossed them back in the tank.

Edit: when they do my test, I'm usually walking around the store checking out new stuff, I'll come back 10 or 20 minutes later and they give me the results so I'm not sure how long it takes them to perform the test.
 
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would those little 5-6 leg starfish cause issues? I found one of them on my zoas tonight after dipping.
 
Those are brittle stars and they are fine to have in your tank, they also eat detritus and help keep the tank clean.
 
cool, I have at least 15 of them.

when I first turn on my tank, I find them halfway or more up the tank glass, then they slowly drop to the sand.
 
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