Hey there shoe armor,
OK guys, ammonia is plant food! ('course its also algae food, lol) but anyway, don't worry about the plants, they'll be fine for now!
More importantly, Paavn is more right than the tone of his post communicates: Its actually much preferable that you continue to feed the bacteria via controlled 5ppm ammonia dosing once each 24 hours -rather- than putting in two platties. If you put the platties in, they will produce only a tiny amount of ammonia compared to the 5ppm and your bacterial populations will die back to a much smaller size (well, somewhat, since it wouldn't be all that long a time) whereas continuing to dose at 5ppm will actually continue to make the colonies even stronger. I would opt to continue dosing, definately.
Extra learning opportunity here is that towards the end of fishless cycling, part of what we're accomplishing is making the fledgling colonies more robust. A lot of people think that as soon as the colonies can process ammonia and nitrite down to zero, the BAM!, its done and they're perfect! But actually, the colonies at the end of fishless cycling are still somewhat fragile and they will continue to get tougher and more stable for the next six months and even the whole first year.
Don't get me wrong. If you follow our formula here on TFF and use the 5ppm, getting drops to zero within 12 hours and have a solid "qualifying week," then you will have a very robust, cycled filter. But it just makes you a better aquarist I think if you understand that in the even bigger picture, the maturity of your colonies is a bit of an ongoing thing!
~~waterdrop~~
ps. (actually we had one of our rare North Carolina snows the last couple days and I had to wear my shoe armor but unfortunately it bruised my ankles and today I'm going back to running shoes, snow be d&*!mnd)