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I haven't heard anything about whether rams are brackish tolerant, but I wouldn't put them in with a puffer. Puffers can be nasty critters and I wouldn't put money on the ram in a fight.
Yeah, I would be very pessimistic about that pairing working. Even a juvie GSP could easily kill an adult ram if the puffer decided he wanted to. Wouldn't even be a fair fight.
I know all about the ways of the GSP. The ram im not sure about, but Im not going to take a chance with such a nice fish. In light of this post, it sounds like that is too much of a risk.