When I started up my tanks with AS and had melting issues.... 3 days into it my plants were long gone. It only took about 24 hours for them to turn to mush. If you have made it this far I think you maybe alright. If it were me I would just keep up with daily or every other day WC's for the first week or two to keep levels in check.
I dont know why it is that my plants were melting with AS so I can't give you any of the why, I don't think it is from ammomina as I have started up soil based tanks with osmocoat slow release ferts in the substrate that had levels through the roof, and had no such melting issues in these tanks..... *shrugs* oh well, hope your plants pull through
WC's seemed to help mine out....