I read up on them, as somebody else mentioned them lately. Seems they start to transfer to brackish at about 3cm and can be kept in water with 1.001 - 1,010g/cm³ density until they reach 10cm. After that until adulthood 1.010 - 1.018g/cm³ seem to be preferred. At about 25-30cm they go full saltwater.
Thanks for your reply I appreciate you looking the info up, they are 5cm long so they should be ok in full brackish water can anyone confirm if the drip method is suitable to transfer them in a few hours from freshwater to brackish water? I got this screenshot from a website about the method mentioned the shop I purchased them from still have them in freshwater I don’t have them yet but want to transfer them into a brackish aquarium salt ratio 1:010.
I have no personal experience but all people that do brackish and saltwater that I know do drip for the salt ratio, so I guess this would be the right way to go. No guarantees, though.
The description looks ok.