i decided i want to set up one of my freshwater tanks to saltwater. after i take my freshwater fish out, do i have to replace all the water? or could i just add marine salt and test the salinity and give maybe a week to set in. i already have sand in the tank from my freshwater set up. im going to start off small with a mandarin goby mainly because they are inexpensive. but i will not put a goby in if i have to cycle the new tank. i know that for cycle fish, you have to use clowns or damsels. this tank is fully cycled for freshwater. i have had several fish living in there for almost a year now. also, any tips on the new saltwater set up? maybe what to watch out for? i read several articles and i read that i do not need any new equipment for the FOWLR setup. all i need is live rock and of course fish lol. and i do not plan to add live coral so the lighting should not make a difference. are protein skimmers really necessary? Please inform me MFK, i trust this website over the google articles i read.
*pokes my fish*