ha ha mr big... and mr not so big(not pictured) do a really good job... due to changing my light, i kept getting a really bad red algea breakout every time I left my lights on regular cycle...(all water perm were normal) ever since I got them my sand is now back to normal.. and the snails clean everything in sight! I do recommend the conch! A.I. had them on sale for $4.00 per! not sure if they still do.. but I would call and find out... if I do leave this tank together.. I will be getting a few more for my 20gl
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