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I was in one of my LFS the other day and saw that they had a brackish tank with gobies, scats and fig. 8 puffs and guppies in it. Are guppies able to live in brackish conditions?
Yes, guppies can go from low to low-mid brackish. Daniel and I have a brackish guppy tank with a knight goby (for population control if ya know what I mean ).
The guppies love it and the knight goby...well...his tummy will tell you how much he loves it, lol.
Guppies, mollies and swords can live in a variety of specific gravities. I've even seen guppies in a reef tank (albeit, they probably never lived long). Mollies, and guppies venture out to full strength SW in the wild quite often.
I thought guppies did not tolerate a brackish tank as well as the Mollies. Saltinity of 1.002 is not brackish. We keep our brackish tank at a specific gravity of 1.015. From the research that I did, swords and platies would not go well in out tank, but I did not research guppies.
OK, so you are in Canmore, which doesn't have a Local FS, so you must have been here....Riverfront Aquariums...yes? If so, those were likely feeders for the puffers and mudskippers.