well i have been thinking on getting another filter for a few reasons:

#1 tank gets dirtier since i added the 2 rams and 6 cory cats.

#2 i want something that will give me a good flow and cleans i currently have a koralia 3 which gives me 850 gph but it doesnt clean at all and want to take it out

#3 and the most importannt thing its easier to hide the intake tube than the power head

oh yeah i have been thinking on getting and emperor 400 on my 75 gallon tank, i have looked at the Aquaclear 110 and the tetra wispers and i dont like the ac110 and the tetra i havent found one rated for my tank

oh yeah 2 more questions

is there such thing as too much filtration??? 

and will the bio wheel be bad for a planted tank i have been told that they are really bad because it remuves things plants need and no because its just a way to get good bacteria and it wont affect it at all and will help with algae