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Thanks everyone for your answers, I should have mentioned that they are just in a normal fish bowl, no filters, and ive got two (ive not even named them yet)!!
I think i know where my problem is, when i change the water, im putting all clean water in and giving the bowl a good clean, Im not leaving the old water, but i am adding drops called Tap Safe to get rid of any bacteria in the tap water, ive just got pellet food, found the flakes makes the water cloudy quickly.
Abbibygum, what was your last sentence going to be - im curious now !!