Do all livebearers need salt in their water?
No they do not, In general most of the common livebearers, Molly, guppy, platy and Swordtails do not need salt, but they do thrive in hard water, Livebearers do not do well in soft water, Salt has long been veiwed as a cure all for Livebearer ailments, really it is not a cure at all, It just covers up underlining problems that will continue to be there. with proper water conditions, nutrition and stocking levels salt is not nessesary, it though can be used as a tonic for already sick or new fish to help them acclimate to their new enviornment, this should always though be in a quarrentine tank and not in your community tank. Some species do need salt, these include the Four-eye fish and the wrestling halfbeak, Livebearers are a very diverse group and each requires perticular enviornmental conditions to thrive.