Cheato not floating

my chaeto sinks.

up until recently, my chaeto started growing again. had a combo of a lot of tank problems.
 
it is suppsed to sink what it does is that it will not attch to sand or rock. so it kinda floats and rolls along the snad due to current. if you raise the water flow then the chaeto will move more. but no it does not have to float. mine sinks
 
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