Lava and Black Devil Spiky Snails as detritus eaters

Ever wondered what happens to your fish in the fishtank if it has disappeared? One of my Black Skirt Tetras died of dropsy and since I like it to be natural I would usually allow the snails to "clean" detritus.
I shot this timelapse yesterday (2016/03/03) during several hours.

[@Moulander]

Maxim! I didn't realize your love of Metal and Aquariums were so related!

[@diandakov]

well done to the snails as they are cleaning the mess :)

[@tinadoyle3803]

OK but what else do they eat ?

[@serj77808]

Супер! Сколько ты это снимал, в реальном времени?!

[@mxmbulat]

+Sergey Dubrovin ~2-3 часа. Это таймлэпс. Фотик щелкал кадры, из которых я потом собрал видео.