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					Originally Posted by  Aquattro
					 
				 
				Do we need to "tune" the tank based on what fish are going in 
			
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 Yup.
I have a 40-gallon breeder that is set up with sand, shells, rubble, all sorts of rock junk, an AquaClear power filter (used to use a MaxiJet, but like the filter better).  It's always set up - been running for years.  Sometimes it gets reef-safe-ish meds like various wormers and it goes into hyposalinity too.  If something yucky pops up, the tank just runs fallow for some weeks.
I also have 20-gallon BB tanks for medicating and tank transfers that just have pipe pieces in them.  They dry out between uses, and are only used if a fish needs to be medicated with something I don't want in the 40.
