A 10 gallon tank will suffice. You can try one of the following suggestions. Or, buy a well known brand of automatic feeder that you can set yourself to the proper amount of food. Weekend feeder shells might not work properly if your pH is way off or temperature is not right. Remember, fish feed best in the light.
Snails often browse on plants when supplies of prepared food, dead fish or algae are low.
Chemicals for snail control are commercialy available, but many aquarists prefer more natural methods. The efficiency of hand picking can be increased by floating a piece of wilted lettuce leaf on the surface of the water. This will act as a kind of bait. Q. I have a 20 gallon tank that has been set up for 6 weeks, the nitrites are still high and I've done several water changes to lower it. Alot of nitrites accumulate during the conditoning period until Nitrobacter bacteria have proliferated sufficiently on filter materials to a point where nitrites are cleared.