Well am only going to put 25 gallons of the old water now on the sand should I clean it or just seed with some and try not to stir to much of the old sand they say it might have some bad stuff laying under it even though I don't have a deep sand bed it might be about 1" only but its really alive its about 28 months old
What would be the best way last time I upgraded from my 30 to the 75 I rinsed it with tap water and then put some in the 75 not much but some I don't know if it was bad or not