Adding Live Sand to an Established tank

[RuGlu6]

Ok I have done it many times, however be very mindful and proceed with caution.
Keep in mind that if you have a relatively deep sand bed I would not risk it.
Anything deeper then 3 inch will have layers of different bacteria and different oxygen content. In that case I would not do it. the bacterial die off will be massive and pollution is unnecessary.
If you only have one inch or so just go ahead and dump it in to the other tank, no problems.
hth