Originally Posted by fishwonder
Did you do anything else to the tank (change water, add anything else)? Did you wash the new plastic plants in hot water or do anything to sterilize them? I would do a 50% water change right now and tomorrow just to be safe. Add your de chlorinator too. I can't think of anything in the water that a test kit would show, unless you changed water when the plants were put in.
I did nothing to the new plants because there were no instructions to (any maybe that's the issue), unless one fish swallowed a tiny bit of loose plastic? The other fish is perfectly OK. I've removed the plants and done a 50% water change. I've washed one of the plants in hot soapy water and thoroughly rinsed it before putting it back - it's now gathering fewer bubbles and is less buoyant. But wanted to see what others think before progressing further.