Mollies are brackish water fish that can survive in salt or freshwater provided they are acclimated slowly. They would keep your QT tank cycled, but I would not want to put them in my reef and have to catch them every time I used the QT.
Okay, how do I do it- do I dump the tank, refill, and add chromis?Or do I leave the tank as is with the ammonia now? What if I have the same thing happen with the ammonia? Do I just leave the chromis to die??
Chromis, Mollies - its the same thing. Either you leave them in the q tank when you medicate, or you take them out. Medicating a not sick fish seems weird. So take them out when medicating. If you are worried about catching them again, put them in your sump or in a net breeder.
I would use mollies because they aren't taken from the wild.
Okay- dump the tank, right? I have (2) sponges- do I boil, just clean in tank water, what? If all goes well- I will add a small yellow tanh- the last fish for my tank- in two weeks.
I have new backup sponges, but they won't be seasoned. Now I have an additional problem- I think one of my firefish- see my thread on dorsal fin missing-is being harrassed, and I may need to move him. I drained the tank, rinsed the sponges in tank water- added new water, and am up and running in anticipation of the possible need.