I'm looking for a 100-150 litre tank, and want to get some ideas for filtration whilst on the look out for a tank. This time I want to go external filter, it needs to be quiet as it's in my bedroom, and reasonably cheap. I'd like to spend no more than Â£50/60 if possible (don't mind second hand so that opens some options up). Any thoughts? I looked at Eheims on ebay but none seem to fit too well budget wise ATM.