Hey Everyone! I have a ten gallon AGA with 1 blue gourami, 2 platys, and 1 ballon molly. I'm on vacation halfway across the country when I realised that I forgot to change my filter cartirage before I left and I'm going to be on vacation for 3 weeks! I needed to change it before I left because it had been there for about a month, but it slipped my mind (gosh I dunno how because i'm sooo obsessed with my tank its practically my life now!!) anyway I don't know whether it will be okay there for another 3 weeks or, whether I should try and get someone to change it for me (my brother is really the only person who could, but he has no idea how my filter works) Any ideas? Thanks!