After winning a couple of goldfish at a local fair a few years ago (amazingly they are are still alive!) I have been through a few fish tanks (one was my husbands old one and two cracked!) - this BiOrb is by far the best! I have this 30 L silver one: you should be able to get it for around £75. It looks good, the fish seem really happy, it's really light to lift and easy to clean out. If you buy their servicing kit then they the water should be clear for a few weeks! I really recommend it. If your tank is prone to algae like mine is, then try the anti algae service kit, it really works.