240 gallon HELP PLEASE

Ok it's been a while but I just bought a large acrylic tank to rehab and put inside the wall of my family room. The specs are 72"x31"x25" it has a single pretty good size overflow in the center but it only has 2 1" pipes sticking up cut at an angle. I'm currently running a 150 with 2 1.5" durso stand pipes and it delivers just the right amount of flow for a mag 12, I thought it might be a herbie system but they are the same height and the stank was started before 2004 ( when herbie came up with this method) will the 2 1" overflows be enough to handle the reeflow dart? The dart will also be teed off to run the refugium chamber at a lower rate of flow. I will also be running a geo618, next reef gfo reactor and an 18 watt up sterilizer. Thanks guys !





Also if anyone has a method of removing dried up, hundred year old coraline from acrylic please by all means share it with me