here's the question....
how much do you like doing water changes and scrubbing algae??
if you dont mind doing both every week, then you might be just fine...
but if you want better water quality, and want to be able to feed your fish heavily,
then you should get a skimmer and run carbon 24/7 on your tank.
it doesnt have to be uber expensive...200-300 and you have a nice skimmer.