it's coincidence I noticed this this morning, posted on one of our infamous on line sellers, web site...
"In the wild, most tetras are omnivores. During the wet season, they have rich pickings of various insect larvae, micro-crustaceans, worms, etc. In the dry season however, these rich food sources are greatly reduced and many tetras rely on detritus, algae, and biofilm to get them through the lean times. This ability to switch food sources make them very adaptable to aquarium foods and they will relish almost any dry, frozen, or live foods offered."
at this morning's feeding, when I took the pictures above, I noticed many of the tetras swimming around, with the algae "cookies", that I specifically put in, for the spotted silver dollar in the tank... so, I think, that I'll be adding a few more cookies, in the future, breakfast this morning was a mix, of Bug Bites, an a custom mix of flakes, containing brine shrimp, vegies, & blackworm flakes, so there was plenty of variety, yet they went for the 8mm algae disks, as well as the other foods...