I can do you one better, I had a TUNNELING betta XD when I brought Vincent home, I had him in a tank with these plastic gem stones as substrate, and I had them stacked up almost 2 inches high in there. They were really light, and he figured out that he could basically push them apart and go hide UNDER the substrate. One time, i couldn't find him, and I was panicking, so i rapped the glass really hard to see if he was just hidden really well behind a plant or something, and all of a sudden there was this great disturbance in the stones and he flew out from underneath!!!! It was hilarious and kinda scary, I ended up moving those stones out because I was afraid he would get stuck in there and not be able to reach the surface XP
My Current bettas:
Sullivan- Orange rose tail halfmoon male
Daisy- Mustard Gas (black and yellow) veil tail female
Milton- Teal butterfly halfmoon male (mom's betta)
DFTBA to nerdfighters working to decrease world suck!