He very well could have been trying to get into position or it could have been nothing. The best thing you can do right now is make a promise to yourself now. Here goes: "I will only check on my breeding snakes once every 24 hours by sliding out the tub and maybe 3 or 4 without sliding it out!"
If you really need to see everything front and center then you should get a display type rack or build one. They might not do anything for a couple of months, but relax if you only check on them once a day or so you will catch them in the act if they are doing something.I know it is hard, but it has to be done.