I have a tank with 4 GSP in a tank SG is at 1.004 for now next week it will get raised to 1.006, it has been cycled and running for over 4 years now. Well it has mixed color gravel and substrate in it. I was thinking about changing it Aragonite sand. What's the best way to do this without crashing my tank? Is it possible to do this with the GSP still in the tank? I've read some people collect the gravel and stick it in a nylon hose or something and let it sit in the tank for awhile so the BB can seed into the sand. Should I wait til I get to the salinity that I want and then do it or could I do it now?