I grow my paphs the way I would think Lousiana pond iris like to be grown. I have a little "fake pond" a Rubbermaid horse trough. At least half of it is filled with lousiana iris of different colors. I can leave them out, of course, and they can survive in freezing weather. The Phrags cannot. They need to be taken out of the water, and moved into the house when the night weather starts getting to 55 degrees. Phrags are soooo picky about water too. Only rain or melt-snow water. In a last ditch, tap water with some chlorine/chloramine remover. PH 5.5-6.5 is best.
When they are inside, they can be in a bowl of water in a net pot with all the roots in the water.
I think another thing if you can get it, is moving water, like a little fountain, or fish tank filter next to the phrag. That would be ideal.