Need some help with cloudy water !

[Raf]

You said you checked your ammonia and it was exactly the same each time... What exactly is it??? My guess is you have some ammonia and nitrite... That's where the cloudiness is coming from. It's not from snails grazing on rock but it could be from snails dying

[TimT]

Cloudy/hazy water can also be caused by a bacterial bloom. If that's the cause then for a tank your size a 9 watt UV sterilizer would clear it up in a few days if set at the right flow rate.