Almost Full Grown Figure 8 Puffer

Circus

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So, I am setting up a 20 gallon tank for a figure 8 puffer, and I know they need increasingly brackish water as they get older.

The puffer will be an adoptee from Petco, someone surrendered about a half dozen to the store. Right now they are all together in about a 10 gallon tank (showing surprisingly little aggression). They are all between 3 and 3.5 inches, so almost full grown.
What water parameters should they be kept in at this stage? I will be getting their current salinity level tomorrow, and matching my tank to that. But what should I be working towards in keeping my puffer healthy?
 

ChasingFish

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I'm sorry that you never got an answer, how did it turn out? My understanding is they are just fine on the lower end of salinity, like 1.005-1.008.
 

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