Freshwater Mixed Rotifers (Philodina and Monostyla):
After feeding fry on infusoria, rotifers "medium sized ciliates" come next in their diet. Some
aquarists state that any breeder having access to an assured supply of rotifers not only could
count on raising almost every fish he spawned, but could feel certain that at least 80% of the
fish so raised would turn out to be premium quality specimens. Philodina is at least twice the
size of Monostyla.