very weird white "cloud" coming from LR

over the last week or so we have been seeing a white cloud of sorts coming from one of our LR chunks, and dont see what is doing it, but it happenes about every day or two. it shoots our of the rock work and then goes away in the water after a sec, does anyone know what this could be at all? lr is only been in there for about 2 months at most, so not much stuff is growing on it yet. TIA
 
if the puff is coming from different areas each time it might be a snail i think its sometimes called a volcano snail cause it shoots out waste through the middle of its shell plus its kinda shaped like a volcano but if the cloud is coming out of the same spot each time then i dont know
 
not sure if its the same area, when ever i see it im not looking right at that spot, so really no idea, if it is that snail, is it ok to keep in the tank or will it get like REALLY big like queen conch do?
 
not it doesnt get big at all perfect lil algae cleaner mine eventually moved from the rocks to the glass they look just like astrea snails from the bottom also they blend into the rock perfectly so they are really hard to find
 
oh yeah what kinda live rock is it also just curious mine was florida not very happy with it it was full of mantis shrimp 4 total
 
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