i think this tank is play sand although i am not certain
how many bags of 15kg will i need for a Fluval roma 125? Thanks again for your replies.
The way I did it was...
put some in a bucket, get a strong hose and spray it until it settles quickly. I did it a fair few times for each bucket and it settled really quick in the tanktakes a while (you'd have to do it with any other substrate anyway..) but should result in nice quick settling sand
I also had a bigger bucket to stick it all in so i didn't have to go from the outside to upstairs and into my tank everytime I washed a bucket of sand