To remove substrate, all I do is shop vac it all out. So quick, easy and mess free. Start with a (very) clean shop vac and you can easily re-use that substrate right away. I'd still give it a rinse with dechlorinated water anyway..
I like the above suggestion of adding new substrate by the container full and carefully getting it to the bottom.
Also like said above, I'm not a fan of sand and prefer a very fine gravel.
I like the above suggestion of adding new substrate by the container full and carefully getting it to the bottom.
Also like said above, I'm not a fan of sand and prefer a very fine gravel.