18 gal res 1 or 2 airstones?

chrome9k

Well-Known Member
i have an 18 gal res, not that deep.... recently i have been noticing a slimy brown film on the hose connected to the pump and to my tray....

i was thinking algae or nute residue

i have one airstone connected to a pump for 20 gal of water...

do you think i am ok with the one airstone or should i get another airstone and put it on the other side of the res
 
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