Questions on when to add new sump to existing 75g reef tank?

[Sgoodwin3]

I recently switched from a 55g to a 75g and turned the old 55g to a sump. The new tanks been up and running about three months (running skimmer, phosphate reactor, and uv stabilizer) and the sump has been running with some live sand, live rock, bio balls, and my old marineland filter about 2 weeks. I have the on tank overflow waiting and the necessary pump cycling water through now. I'm looking for any advice on time frame to combine the two and any other best practices?

 

[Terrance]

You can combine now since both tank sounds stable judging from your description.