I'm risking a lot here, mostly because I've spent weeks, if not months, trying to find a set-in-stone answer. I currently have 4 Mollies and other various tankmates, and I've been wanting to buy a dragon goby for years now. Now that I'm older and understand the care needs for this goby, I also understand that some of my other inhabitants might not fare so well.
30 Gallons (will be upgrading to 55-75 if I decide on the Dragon Goby)
4 Mollies/ 3 Fry (in breeder net)
1 Albino Rainbow Shark
1 Kuhli Loach
1 Common Pleco/ 1 Pleco baby (trying to sell the adult pleco)
2 Fiddler Crabs (which I know won't last long, because Wal-Mart employees are dumb enough to sell these as fully aquatic to people like me who buy on a whim [which I never do, but these I didn't do my research on until i got home, so I'll enjoy them while they last.])
I already know my Mollies will be fine with the addition of salt, but I'm worried about the Loach, the ARBS, the plecos and the crabs, being scaleless. I wouldn't mind having to get rid of the loach and plecos (i barely have algae growth as is, and arbs takes more care of that), as well as the crabs and platties, but I'm really hesitant on getting rid of the albino rainbow shark, she's one of my favorites. Is there any reasonable medium to how much salt I can add to make the mollies/goby happy and the rainbow shark not miserable? As well as with the rest of the community.. Any advice is appreciated, I get so many mixed reviews on the internet; this is the most trusted forum in my opinion...