Not used asda but i have Argos,tesco and homebase. As long as they are childrens play sand i assume there ok but i doubt their from the same place as the sand is different colours depending where they came from. E.g my 350L tank is argos and very light colour but my shrimp tank the sand is very dark from tescos
I have asda play sand in my tank i am currently cycling, i havent had any experience with the others. The asda stuff is quite light but i was really pleased with how it looks in my jewel vision. I ended up using 2bags to get a good covering and just followed the instructions on here to clean it, took about 20 mins per bag to clean.
£2.99 for 15 kilo's at Argos. I used about a bag and a half in my 125, so your two smaller bags should be enough too! Get some pics up! Whats your plan for it?