i thought that myself the sand is not that deep about half an inch i have got zeo carb ill but that in my filter thanks for the advice i also think ill buy a new test kit for the ammonia as the one i got is old thanks for the adviceCheese Specialist said:The sand doesn't look deep enough in that photo for you to have dead spots. Do you have an ammonia problem? Amonia will cause the tank to smell and I could imagine it smelling piss like. lol