Anyone know what these are ?

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tdlawdo

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Welcome and say hello to my little friend (A. P. Tasia) Funny story when i got my first 8 gallon biocube 15 yrs ago or so FOWLR after a few months i notice these and thought ... oh cool i got some free anemone on one of my rocks somehow. In no time flat the tank was literally covered in them. Then i did some research and found out what they were. I bought a few peppermint shrimp and a file fish and within a month they were all gone never to be seen again.
 

Afterburner

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If it is only a single or few aiptasia, you could try the Kalkwasser paste trick on them. I bought a cheap biocube on Craiglist that had some corals I wanted and decided to keep the cube as a QT. I soon noticed an aiptasia showed up, so I blasted it with some Kalkwasser paste and it died quickly. Another showed up 3 or 4 months later and I blasted it too. I have not seen any others yet, but it is a quick an easy fix if you only have a few to deal with and you don't want to treat the entire tank.
 
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If you don't keep your sand bed clean it will cause your tank to crash.

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