Everyone's done a good job advising you, definitely run them concurrently for a few days. I just wanted to add 1 thing.
Pull the plates at the same time as the tubes, trust me. I tried it the other way, like you had planned. All you will do if you leave the plates in is create more of a mess. The crud under the ugf
will just continue to muck up your tank worse. Pull the tubes and one side of the ugf
all at once. Then wait a few hours for everything to settle and pull the other side. I had two 10's w/ ugf
's and I pulled the plates on one and it was messy but not too bad. I ran out of time and only pulled the tubes on the other one. Then due to just sheer forgetfullness and laziness those ugf
's sat there for a few months, by the time I pulled them it was a royal mess and just terrible for the fish, so bad in fact that I transferred them to another tank overnight. Best to do it all at once.