55 gallon tank

I got

fluval 404 = 340 gph
other filter = 200 gph
powerhead #1 = 238
powerhead #2 = 238
total = 1016


so divide that by 55


1016/55 = 18.5 times an hour.....


hmmmm sounds like a lot when I was adding it up hehehe


another question these powerheads I have right above the sand and its blowing the water pretty good now I feel like my snails are in a hurricane should I put them up top?


LET ME KNOW.....