Really nice piece of driftwood there and Java Moss is one of the bettas favorite resting places. Be prepared to pick up strands from all over but he will love you for it. They drag it around all over with the fins sticking to it but it is truly worth it all to see how much they love all the comfort of resting on it. You will love watching him playing on it.

Good luck it does sound like a great idea.

Thanks for being such a concerned betta parent. Sounds like your baby is going to be very fortunate.

Rose