Originally Posted by thebigzone
I am adding aquavitro calcification twice a week to raise calcium. It says it accelerated coral growth. The guy at the lfs say the salt has iodine and magnesium I have 65 gallon tank with yellow tang ( I know needs bigger tank) 2 clown a sixlined wrasses 10 red hermit crabs and 2 emeral crabs. I also use a r/o unit. The tank as been set up for 3 months button polyps have been in their for two weeks I have also been dosing the tank with oyster eggs once a week. which the guy at the lfs tood me to do for pipe organ which have been in for one week
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Ok, lets start with the salt, iodine, magnesium... while these are in the salt mixture, these things are also being utilized by the animals in your tank which means they need to be replenished, sometimes more than others. Some animals will use more of one thing or another, sometimes the water chemistry is such that an animal ends up either using more than expected or uses something totally different than expected. The only way to replenish what they use, using your method, is to do water changes. How often are you doing these? If they use enough they can deplete the amount in the aquarium between water changes unless you are doing daily changes. Some situations, especially reef tanks, tend to need dosing of something or other as a supplement to keep proper balance for good animal growth.
On to the calcium. 380 is at the lowest end of acceptable, which means that if something utilizes calcium between additions, it is going to temporarily deplete the tank of enough. A better, safer calcium reading would be 400 - 450, which then gives you a little wiggle room between additions. Are you testing this before or after you dose the tank? When you test also makes a difference, and you can use the test kit to help track fluctuations during the course of a day and a week. Unless something is sucking up a lot of calcium you should be able to bring your level up quite easily by increasing the amount of each dose by 1/4 of the original dose. If, after a wk or 2 of the increased dose you don't see an increase on your test readings, increase each dose by another 1/4. If that still doesn't bring it up (sometimes it won't), then there is indication that magnesium is low and needs to be supplemented.
Content of one mineral will play directly to the amount of another, so if one is off, eventually they all start to go off... easier to catch it and fix it right away. These fluctuations will affect how happy corals are in the tank, as well as all other inverts and even fish.
Given the amount of time the button polyps have been in the tank I wouldn't be too concerned yet that they haven't opened completely. Corals stress just as much as any other animal, but they also have more specific needs/requirements that must be tweaked to get it just right. Circulation will also be a factor, and placement in the tank can also cause issues. Too much light is just as bad as not enough. Too much circulation just as bad as not enough. Take your time and play with it until you see they are happy, don't add anymore animals until all of the current animals are thriving (to avoid new issues and to help avoid masking of issues).
If you need more help please let me know.