I made a DIY bubble cloner similar to the guides around the internet and it in theory works great, splashes a lot of water and covers the whole top. However I have had clones in there for 3 days and for some reason some of the stems have curled towards the top rather than keeping on the surface of the water. The stems are around 3/4"-1" long. Any suggestions on how to fix this?
You dont, its fine. Most of the time if I split the stem and put it in the cloner it will curl a little, the more I split the bigger the curl but I dont think it does any harm.