I am just switching over my foreground from glosso to HC 'cuba'. I bought 5 pots to seed the tank yesterday and have put down 3 and 2 of them are still in their plastic pots.
I have been watching them all night. As they begin to pearl they slowly drift to the surface, lose the bubbles and then slowly sink to the bottom. This has repeated itself over and over all night.
Reminds me of those cartesian divers made with plastic pop bottles we used to make in science class.
I find this very interesting (or am I really tired and should go to bed?).