I connected a 35 and a 45 gallon sump under my 200G tank using two bulkheads and it worked just fine. If you're not going to use PVC pipes in between the sumps then you will want to get some extra gaskets to put in between the sumps. It would be best to have a small amount of pvc in between the sumps though as i had an issue about 1 year in as the gaskets shrunk a bit and the bulkheads had to be tightened.
Suncrest is absolutely right about a generator. June 12th my power went out due to the record heat. The power was out for more than 5 hours my Honda generator saved my tank. I highly recommend the Honda generators they have clean power for electronics and run quiet. They are more compact and can be easily transported. The generator ran all components of my 200 gallon tank with no problems.
I have 6 Pink Mohawk Zoa colonies that need to find a new home. They are growing fast and each of them have around 10 heads. Looking for $20 for each colony.
@spectra If they all sell I can always frag another piece, the main colony is getting pretty big. Not sure when I will be near Portland next, I try to avoid it as much as possible lol.