Well last night before bed I filled it with water and left it to settle in, when I got up I looked for info online and someone posted in a forum about poking the sand to get the air out, sounded like a painstaking task but I did that, got lots of little bubbles out, I read about snails somewhere before, I know they multiply like mad and last time I had snails I had to strip the tank and it's all long, so I don't want to do that, I'll have to get a loach to take them out and that's more expenses for me in the long term, tested my water and that's fine, I Have a sponge filter before the water gets to the impeller then it goes through a box filter with the activated carbon in so it should be okay, with luck on my side lol