white tube things growing????

mojuave

Reefing newb
I have a newly established tank and it started growing greens, browns and purple algea--good right?? also my crabs are multiplying little babies all over but what has me concerned is cloudy looking white tubes growing on rock
 

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Hard to tell....could be just qtip sponges (good filter feedders). I have hundreds of them in my sump and overflow.
 
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