I initially tried to forego a small plastic jar but it was too light, too deep and I was afraid the plastic would get into the aquarium. probably about 2.5 inches wide. It's deep enough to keep food in if my habrosus kori decides to play in it (photo here).
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review