Hi there I've just cleaned mt tank out because it had really bad smell coming from it, the water is fresh and filter and pump is working well,but turned light on this morning and slight smell from it and the water looks cloudy, any sollution please, thank you sara

I would do a 30% water change and test all the water levels. If it has suddenly gone cloudy then one of the levels may have reached a high point (ammonia most likely).

If all the levels are normal then you can buy drops to clear the water, they work by binding tiny particle together so they are larger and get trapped in the filter rather than just cycling through.