Combining two tanks

Long time no post fellas! I've had alot of success in the past few months with both my tanks and now i'm ready to go ahead and change it up some. My 90 gallon is still on a canister filter and HOB skimmer. I've tried tried and tried to get the micro bubbles to disappear and havent gotten them all the way gone. So this problem still stands to this day. Currently in that tank is just two clown's and 150lbs of live rock. They have been in there for about a year now. In addition to my 90 gallon tank, I have a 210G reef ready tank with a 50 gallon sump. In this tank is 250lbs of what was dry rock, 200lbs of sand, a marble cat shark, wolf eel, lionfish and a toadfish. I'm ready to move on from this aggressive tank, as I can't put anything else in the tank with out it getting ate or attacked. I'd like to move all my LR from the 90 gallon to the 210 and basically start from scratch on my 90G. I'd like to do overflows on my 90 and convert it to a sump setup.

My ultimate goal for the 210G is to have it be a beautiful coral tank with some different tangs. I know I will need to upgrade my lighting system to be able to do this. What kind of flow do I need to add to my 210? It currently has two Koralia 1300GPH heads in there now and I have two I can take from my 90G and put in there if needed. The tank has a 300G reef octopus skimmer in the sump along with 25lbs of Live Rock.

Any input is deeply appreciated.