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Hello, I'm still new here So I keep some RCS in 7 gal tank (30x30x30cm). I use aquabides for water and I put some bacteria starter. The filter is hang-on filter with surface skimmer and the lamp is 5W LED. I use soil and put some plants there (cuba and monte carlo for the soil, and some java flaming moss, some cabomba, and a tonina fluviatis). I keep around 20 RCS there. At first they looks happy. Swimming around here and there but after some time it looks like they are just sitting on one spot not tends to not move. Some of them are molting and usually the "ghost" will be eaten by others but no RCS touched that skin. I put some HIKARI Shrimp Cuisine and they don't even touch it. Today when I checked on them nearly all of them are dead at the bottom of the tank or outside the tank. All is dead except one RCS that hang on the carbon filter (outside the water). I put the survivor on a glass with distilled water and some tissue. I observe it and it looks like the RCS is covered by some diatom by its mouth and when I transferred it into the glass it looks like puking diatoms too. The water on the "graveyard" tank is somewhat slimy and the surface skimmer can't absorb the slime. What must I do and what is wrong with this tank?