I am currently keeping Lyonsii also. Mine are in a 75 gallon I have one 8" male one 5" male and three 4 1/2" females. They recently had a spawn on Easter, their first, and the eggs wound up turning white.
I try to vary their foods. Mostly pellets or sticks,freeze dried krill and their favorite is frozen krill.
I don't do anything special on temp. It stays at 76*. Water changes of half the tank volume monthly.
Am hoping to see more eggs soon, the pair are going through their spawning ritual again so hopefully something in the near future.