Join Date: Jul 2012
Location: Third Planet From The Sun
The consensus is that silk plants are definitely better. You'd have to do the pantyhose test to see if the plastic ones you have are okay or not (if pantyhose snags on your plastic plants, then they can ruin your betta's fins).
If the poly-resin stuff was made specifically for aquariums, then you should be fine. If they were made for something else (terrariums, etc), then there may be issues of something leeching into the water.
"I want to share something with you: The three little sentences that will get you through life. Number 1: ‘Cover for me.’ Number 2: ‘Oh, good idea, Boss!’ Number 3: ‘It was like that when I got here.’” (Homer Simpson)