Strange behavior in juvies, are they sick?

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Evenstarms

Jack Dempsey
MFK Member
Aug 22, 2011
36
28
36
Vancouver, WA
I have a 55 gallon grow out tank with some 1.5 inch guianacara, geophagus and satanoperca juvies. On occasion a few of them, not all, will rest on the sand and make snake-like movements for a few minutes and then they snap out of it and act perfectly fine. They all look and act perfectly fine otherwise. I was wondering if this could be a sickness or parasite causing this and if I should treat them for anything. Any advice would be appreciated.
 
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