Platy Flouncing off plants

I have a 3.5 gallon tank with 3 platies. It has been fully cycled for 2 months now and water parameters are:

Amonia 0.0
nitrite 0.0
nitrate 0.5
ph 7.0

I will be upgrading the tank soon to a much larger set up as my female is pregnant. I have live plants in the aquarium and noticed my fish have been doing flips and flicking themselves on the plants. The pregnant female has a little white beard that was never there before and now my male has a little white spot on his face.

My first thought was ick so I did a complete water change. I keep cycled water in gallon jugs on standby and I washed out all the gravel. I've been treating with ich guard and melafix for a week now with no changes. Aside from the flicking the fish are active and bright. No inflamed gills, no off coloring, no stringy poops aside from the poop streamers my fish usually swim around with.

Hello. I’m not expert, I’m still learning ( other members are on this site are very knowledgeable ).

But i had ich or white spot in my old tank. I used a white spot treatment ( the brand was Aqua care ). It’s was blue and I mixed a solution with tank water, as the instructions stated. I was advised to raise the temperature in my tank, and keep it high for 10 days after the treatment had finished. No higher than 28 degrees Celsius. My ich cleared up after a few weeks. I no longer have the fish or that tank ( I re homed them because they were not suitable for my set up, but they were healthy again after the treatment )

The water in a fish tank does not get cycled, it’s the surfaces on the tank and the bio media that hold the good bacteria. So throw the old water away and add fresh declorinated water. The white spots / spores can float around in the tank so it’s maybe possible that they are in the water you kept.

Good luck