The male is guarding eggs, I confirmed. I ordered san francisco brine shrimp and have rotifer cysts on the way.
There is an aquabid listing for paramecium multimicronucleatus. It says it’s a large paramecium. Still appropriate for the fry?
http://www.aquabid.com/cgi-bin/auction/auction.cgi?foodl&1375166664
I also contacted this local supplier of paramecia for labs growing zebrafish. It is expensive , maybe the previous cheap culture is good enough.
http://www.parameciavap.com/par.html