If you mean those rainbow shades I wouldn't use them for children or fish. But neutral shades of beige/tan/grey should be OK.
But having said that, it is always risky using a sand which has no reviews about its safety for fish. We have several members on here who use Argos play sand with no problems. But no-one has yet said they use a different brand so they are unknown from the safe-ness aspect.
But having said that, it is always risky using a sand which has no reviews about its safety for fish. We have several members on here who use Argos play sand with no problems. But no-one has yet said they use a different brand so they are unknown from the safe-ness aspect.