I wonder if a reef tank is a good idea for someone with OCD/OCPD - seriously, it will never be exactly the way you want it and there are SO many things to obsess about -
Water parameters
Lighting
Livestock health
Water levels
Flow
Disappearing/reappearing livestock
Feeding too much/too little
The various pests that come and go (flatworms, vermetid snails, hydroids, etc.)
I mean it goes on and on and on... I'm not OCD and I've still lost sleep over wondering what's going to go wrong next. Not three nights ago I woke up at 4:45am to pee and decided to check on the sea hare I'd just added. I wound up standing on a stepstool at 5AM in my tank top and panties with a latex glove on my hand and my arm to the shoulder in my 24" deep tank to retrieve a mini maxi anenome that disengaged and wound up upside down next to my torch coral.
This is what having a reef tank is. It can be relaxing but there's never a dull moment and it's not predictable. At times I find it actually stressful, although of course it's rewarding enough I keep going. Just wondering for the true obsessive-compulsive if it might not be a good thing, but that's something the person should evaluate before jumping in!