Lol this is a great thread, this question is always coming up
I too am guilty of the spoon collection in my tank
I used to use aquarium plant weights (lead i think) but after a while they became brittle and would sometimes break after multiple bendings, not going to use them again...
Foods I like to use:
Zucchini, Cucumber, Squash, Carrots, Frozen Peas(Sinker), Canned Green Beans (French cut for fry, Sinker), Large flake Spirulina
Foods I tried but didn't work so well:
Tomato, gets squishy and my plecs wont eat the peel, big lettuce leaves, the plecs had loads of fun playing around on them but turned into snail food as the plecs would only eat the stem of the leaf. Pressed algae wafers, they'll get sucked on right away but after a while they break up and just make a mess.
Foods I want to try but haven't yet: Potato, Yams, Pumpkin, Repashy <- Looks interesting