hi mrs!,welcome to the forum. the difference beween the two is that there are tropical freshwater which is as it says freshwater and there is tropical brackish water which is freshwater with some salt added. not sure of the quantity of salt tho, i'm sure someone will fill in on this... hope this helps pebbles
The Fiddler has been living with Platys and Mollies for about 8weeks and everything has been fine, I have started a new tanks and decided to have more Fiddlers.
I bought 4 Balloon Molly fry from the lfs and when they get a little bigger I will transfer them into the Crab tank