kakak99

No problem, good to share experience with each other. I have aiptasia out break before. I can recognise them even when they are 1 mm dot. They are very persistent and hard to kill, tank only safe when you kill every single cell of them. Especially if you are keeping LPS.

Recycle mean clearing all the dead tissue in water for few day. Renew it as a new home for bacterias to grow. Usually about 4 days, which mean the rock don't have dead smell any more. Need to change water a few time. And need to put pump to make the water move. You can Google on recycling live rock. There are many different methods, but theory about the same.

Sudden change in temperature don't know if will crack the rock. But you can give it a try if you are up to. After that you will still have to recycle the dead tissue, worms etc before putting it back to the tank. Remember don't put pump or wave maker in boiling water, they will spoil.

I heard that some peppermint shrimp after clearing all the aiptasia, migth start to operate on other coral if you don't feed them well. Any tissue of aiptasia left in the rock gap will grow into new aiptasias. The best way is still to recycle the rock, clear them forever if possible.

I think the best product is Red Sea Aiptasia X but then you must use it correctly to be effective. Copperband might eat coral also. Or I would suggest you remove the affected rock and treat it outside the tank, cycle with tap water for few days to kill the smell then put it under the sun for more than 7 days, then cycle with your tank's old changing water before putting back into your tank. Probably you want to try reading more on how aiptasia spread, once they sense danger they release their planula (babies) into the water. Adult aiptasia are like stage 4 cancers.

Your tank have aiptasia? Peppermint shrimp is hard to get in Singapore. If you can't get your peppermint shrimp, you can try Red Sea Aiptasia X. Have to get rid them before they get out of control.

Seem like it is at reproduction season, the while color could be sperm...

Recently there is a new release of a very small chiller, great for nano tank. mm don't mistaken I am not a salesperson http://www.aquamarin.com.sg/productsDetail.asp?productid=2267

Is the tank new? Is there any dead fish or dead coral in the tank? Or many left over foods? Tank over loaded with livestock? Try to do major water change eg 40% once a week till ppm drop, suck up left over foods on the floor and don't over feed.

Yuma close up is ok, is not sick. Green yuma are tougher Could be many reason, probably you could provide more detail your yuma closing all day? new yuma? By the way, yuma is not LPS, you can post in soft coral section instead.