Cycle question

[The Grizz]

Should not be a problem, just make sure the rock stays wet as to not cause any die off. I went from a 65 to a 155 the same way and had no issues at all. Take all the rock out you can without disturbing the sand ( if you have sand ) remove all the water you can again without disturbing the sand. Then pull out the rest of the rock, give it a quick dip in some fresh salt water and into the tank. If you are planning to use the sand from the small tank, give it a good cleaning first to remove any built up toxins.