Alot of people argue over this. Some people say brackish and some say saltwater. Some even have there green spotted puffer in freshwater. So which is it?
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Brackish
Mine I bought from my lfs. It was being kept in a breeder box inside a FW tank. It had been separated into the box after bullying the other fish. (Cichlids if I remember correctly) Very dark in color, extremely unhappy. She's much fatter and brighter now, SG currently at 1.014.
You see a huge difference from them being kept in FW. More active, better coloring, and a much longer life span.
An inch, many an inch and a half. Still small. I'm not raising the salinity anymore until I get her into a 75, with the saltwater works. (Sump, protein skimmer, etc.)How big is yours? Mine is a little over 1 inch. Still pretty small. I will most likely keep mine in high end brackish, as I don't want a saltwater tank.
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I'm just curious here, but have you ever kept or heard anything about the Fugu Orange Saddle puffer? They're unique, where they go from fresh to brackish and finally full saltwater as adults. I had one for a little while before I lost her. She was an adult when I bought her at the LFS, and should've been in full salt. They had her in FW. It was several months before she died but it was pretty devastating. Such a gorgeous puffer. They rarely last in captivity sadly. I'd love to find a juvenile Fugu and try again but haven't been able to yet.Okay, so i kept a bunch of these guys, and have done more than enough research, i even did an experiment with them and conversion of a tank into full reef marine. They should never be kept in fresh. In Nature they are never in freshwater and they shouldnt be in captivity either. but, young ones are born and grow and develop in brackish streams. In fact they do better min brackish than in salt. if they are in full saltwater they will not develop correctly and have a multitude of problems. But as they youngens grow they travel down stream into full marine and reef environments only going back to brackish to lay their own eggs. An adult can liver in a brackish tank, but its just not its natural environment and they will visibly be much happier in full salt. Because of this these are tricky fish to keep truly happy, they need a tank that changes with their needs as they grow.