Thanks again.

OK, I've read the cycling stickies and a few more - no wonder they don't tell you this in the pet shops - there's a bit more to this than feeding and changing!

I just emptied out most of the water, leaving the gravel alone as instructed. When I was refilling the tank a large amount of stuff came up from the gravel - waste, bits of veg that I put in yesterday and just general stuff. It made the water really cloudy. I left it there and let it settle before putting the fish back in as that's what it says in the cycling sticky - never wash the gravel. My question is, if there's that much stuff, can I just empty out that water with the stuff in it or does that constitue cleaning the gravel?