i have a 10g tank which i want to get an AC, at the moment i have fry in it with a box filter so i want a power filter. i would get the 100 so that the current is not too strong. later on i want to change it into a zebra diano tank and i knew they like current so i would get the 150. now the thing is which one to buy? i dont want to have to buy another filter for when i get the diano or have the current to strong for the fry. so what should i get?