We have some black and brown "shelless" snails in our tank.  They work hard, but they are increasing their population.  This a.m. I watched one of them - seriously - smoking [?] and he kept ejecting small smoke rings for a while [talented too].  So, at what point are these things a problem to be dealt with as opposed to an oddity.  Right now I can count about 5 or 6 of them, but wonder if we should be trying to wrestle them out or.....just not sure.  
I am concerned that what I saw was spawning so I thought I would like to know what others have experienced with these.
								I am concerned that what I saw was spawning so I thought I would like to know what others have experienced with these.
 
				 
 
		 
 
		 
	