Marine Sand ?

Hi I bought some new sand . Checked the back of the packet it didn't say coral sand unlike the other pkt near it of the same make . I double checked at the counter and said this isn't marine sand is it . He also checked the back and looked at the grains and said no it normally has bits of red in if its coral sand .
This was Maidenhead aquatics by the way.
So I've put it in the tank inspecting my fish with magnifying glass and think. Can see red or reddish brown bits ! Suddenly sent me into a panic . If it is what would it do and how can I check .
I think I'm going to give up on fish keeping its far too confusing .
Ally

I have to say that the tank looks lovely. 

Hi
Don't have the packet . I think it may be tana sand from googling it. Though it didn't say what it was on packet . Is tana sand ok it has white bits in it .
Ally

Hi Ally,

Here's a pic of my Unipac Tana Sand. I wouldn't describe any of the grains as red - instead, white and various shades of brown. I've also checked the pack, just in case the colour has changed since it's been in the tank, but, again, what's in the pack doesn't look red at all either.

When I was last in my LFS (MA), I didn't see any Unipac sand although that's what I purchased there 2 years ago. They had packs of Aqua Range and JBL substrate in stock and possibly another brand but not Unipac although that's not to say that they didn't keep it out the back of the shop. Take a look through https://fishkeeper.co.uk/productshowroom/aquarium/gravel-substrates and https://www.jbl.de/?lang=en&mod=products&func=group&id=3397 and see if any of them look a possibility - looks as though the JBL Sansibar red may well be what you've got?

I'm very happy with my Unipac Tana sand which I've had throughout my 2 years of tropical fishkeeping (although I / the fish would probably prefer a darker colour because this is more in line with my particular species' natural environment and which I'm considering). However, from a functional point of view, it's perfectly fine and looks good.

PS. Attachment (pic) can't be saved; I'll keep trying.

The easy way to test it is either if you have a tiny bit that didn't go in the tank, or if it's all in remove a pinch and leave it somewhere to dry. Then add a few drops of vinegar and watch carefully for any bubbles. If there aren't any, good.

And you can measure your tank's pH now and again just before a water change, or a week whichever is soonest to see if there is any change.

The easiest way to deal with air pockets is to stir the sand gently with a long stick.

Since you cleaned and refilled the tank yesterday the pH would be the same as freshly run tap water which is usually different from water that has stood for a day. Use today's pH as the starting one, and see what happens over the course of a week. Yesterday's pH right after the water change will be different just because the water hadn't stood overnight.

Ammonia is the first thing to show up, but you don't have a tester for that. Nitrite is the second thing to go up, so by the time that registers a reading you could have a high ammonia reading.

You need to do either daily water changes of 25% or get an ammonia tester so you can check.