Bigger tank questions

[This weekend was #### and fun. I moved into a nice 40gal from an 18 gal. Ok.. i didn't use any of the sand from my old tank... cause i thought it would cause an ammo spike. I have all cured live rock in the tank. Is that enough to seed the sand bed or do I really need to use a cup of the old sand to get it started... ????]
 
[You can use a cup of sand from your old tank, scooping it from the surface. The LR will seed your new sand as well.]
 
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