Im thinking of changing my internal fluval filter to an external filter. the problem is there are so many external filters on the market that its really hard to choose, my tank is approx 150 litres and contains rummy nose tetras and a couple of rainbow fish and quite heavily planted..... Any recommendations. ? maybe it would be cool to set up a "forum poll" section for people to vote on new products, i reckon it would kind of helpfull for people to make better choices. thoughts? marc.