We have had three Danios for almost a week now and the water has got pretty cloudy in the last two days.
It's a 19L tank and has the filter it came with. We let the tank run empty for 4 days as advised by the place we bought it. They then tested our water and said it was fine so we got three Danios.
The fish seem happy (as much as fish can)
Do I need to clean them out? Is the filter good enough or do I need to get a better one? The lady in the shop gave me the impression they wouldn't need cleaning out properly (gravel etc) much at all but after reading up some more maybe I do?