ok i think i've got all the answers. i'm actually doing this on behalf of a friend so let's see
1) Had the Bi-Orb since November 2002
2) It was cycled properly
3) She keeps 8 red eye tetra
4) They're fed a few flakes every day
5) Lighting - standard halogen bulb in the tank
6) Direct sunlight...
it's really strange - I clean my tank regularly and haven't changed anything I add to the water, but recently, the water goes really cloudy within a few days of changing it. Has anyone got any suggestions why this might be?
thanks!
anya