50 gallon on 20 gallon tall tank?

i have a 20 gallon tall tank with 2 female swordtails, 7 neon tetras, and 2 silver-tip tetra, 3 neon tetras died and im not sure if it is the food im giving or the filter that the flow is too powerful for them. i am wondering if i should use that 50 gallon marineland penguin 200 bio-wheel filter on my 20 gallon tank because my parents went to buy me 8 more neon tetra fish and the person said that it would be better if i would have a bigger filter with the 20 gallon so that i can put more fish. i use to have a 20 gallon aqua-clear filter that i still have. should i be using this filter on the 20 gallon tall tank?