whats the difference ?

FOSELONE

THINK BLUE
6100, 6101, 6200, 6201...very interested in buying a pair but dont know wich to go with...my tanks 7 feet long...30 inches wide...& 24 inches tall...dont know if ill be using the vortechs...
 
6100 and 6200 are obsolete and were replaced by 6101 and 6201. What do you intend to keep?
 
I would get 2 6201 as they have the wider flow pattern better suited to your tanks width.
 
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