Detritus worm in my flowerhorn tank

Tony90

I have detritus worm in my tank. My tank is 300 litres i use 7.5 mil of formalin anyone used this befor for this problem also should I do water change in 3 days and redose? Advise for anyone please thanks.
Also they r harmless right if not treated ?
 

RedOnion

Detritus worms are food for the flowerhorn. Not harmful at all.
 

Tony90

Ok
 

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