So after lots of reading and researching, I went out to buy a big tube of GE Silicon I for Windows and Door, a few craft plastic canvas, some river stones, a couple of glass pepper and salt shaker from the dollar store and borrowed a caulking gun and went to work making a few caves out of the pepper and salt shaker jars by gluing small river stones on it after removing the lids and tunnels from the plastic canvas and sticking stones on it. After patiently waiting for 3 days, they finally are safe to put in and I put it in this morning. Out of 5 of my bettas, only Ebi my VT went in to his cave to check it out and only Wasabi went in to his tunnel. The others pretty much prefers to cruise around but won't even check their caves and tunnel out. I also thought they'd sleep in it but they won't. I just checked on all of them and they are sleeping in between the plants but none in the cave. Do they not like the caves and tunnel I made them?

I am a little dissapointed as I was hoping they would enjoy the extra hiding spots and play in it but they seem to prefer open space more. I thought bettas like to hide?
And when they see me, they would just forget about everything else and just wriggle for food and attention so I had to sometimes hide to see what they are doing or I just sit very still for a while if I am in front of them before they forget about me and resume their own activities.