Help me ID flatworm

BurgerFish

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I see it only in fuge, nothing in display.

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Brown flatworms.
 
Brown??
These are acoel flatworms and more of a nuisance than deadly. Siphoning them early will assist in removal.
The best way of controlling acoels is by prevention by maintaining low nutrient levels in the aquarium with the use of carbon and good protein skimming, and strong water flow which will reduce the population.
Best and natural means of control include adding wrasses such as the Six Line Wrasse , Leopard Wrasse and dragonets such as the Spotted Mandarin goby. The blue velver nudibranch will also consume acoels but the blue velvet is very sensitive to changes in water chemistry and dont live long in captivity.

Another method of removing acoels is by doing a freshwater bath or dip. Acoels and flatworms are very sensitive to salinity changes and by dipping the colony in dechlorinated freshwater for 5 to 10 seconds and then shaking the colony while theyre in the freshwater, it will cause the worms to lose their grip and fall to the bottom of the container. Be sure the freshwater has the same temperature and pH as the aquarium's water in order to reduce the amount of stress on the colony.
 

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