transferring fish tanks

I'm upgrading my 14 biocube to a 29 biocube. The only part I'm really confused on is the substrate. The new tank is going where the old tank is so i have to set it up as I'm taking down the other. So the question is.... New substrate or use the old and top off with new?

 

I just did an upgrade as well and at the suggestion of another member I used new substrate. The amount of filth that was trapped in the old sand bed was shocking.

Just put a couple of scoops of your old sand n top of the new sandbed, the bacteria will eventually colonize.

Also rinse your sand really well to get rid of the silt, when I transferred tanks i created a dust-storm in the water and it was like looking into milk. Very hard to arrange rockwork and corals without crushing anything.

 

What will you do with your old tank?

 

I'll probably sell it lol