Betta food, I would have never thought of that.
Betta pellets are a common choice to feed sundews with. I use them myself. They are the perfect size for larger plants like D. capensis and voracious plants like D. burmannii, but need to be crushed up for smaller ones. Get it down to a fine powder and you can even feed seedlings with it.
Strangely the main ingredient is fish, which isn't exactly normal sundew food, but they digest it just fine.
I like to use beta food, because it gets (almost) completely digested and absorbed, so the leaves can dew up again, and look new for much longer. Bugs can burn tentacles, and they leave their shells there to rot after being eaten. What I did, was grind up an entire small container of beta pellets, and it is lasting me years. A few bits stayed bigger, like the one in this video, but the large majority of it is powder/sand. The big ones, I just use for burmannii, regia, capensis, etc..
Doom, why do you not use trays for some of the pots? Isn't the runoff dripping all over the fixtures below?
I was waiting until I had enough to set up my tray, and then I've honestly just been a bit lazy with it. I know they're not completely waterproof, by any means, but I sealed up the part where the wires attach to the light fixtures on the bottom shelf, so water runs off of them. I still don't like it though, and am going to set up another tray very soon.
I probably wont put my vft's, ping, or ceph in it though. Only the dews.
I usually water my ceph by heavily misting the moss on top, and then every few days when the pot gets lighter, I soak it, including the plant itself, since the root ball is in the center, in a big chunk of peat/sand.