This works very well.
To mature a tank and not upset delicate fish, why not get a plastic tub or bucket, cut a hole in the end of it and silicon in a plastic pipe as an over flow.
Than place a power head in the sump area (if you have a sump) or in the tank and pump your water to the tub and over flow back in.
You than get some tough fish and crabs, what ever, ones you will catch in rock pools or on a fishing line and have them living in the tub and over feed them for a while as they are very strong and the tank becomes very mature, put the fish back after a while and what ever and your tank is matured via a remote tank.
While this is happening,think of what fish you will get ,s soon the tank will be very stable as if you have had all your fish in there for ages.