You've got some serious filtering to do!
Lots of fish, four turtles and frogs.
I have experience with all three of them.
Turtle poo is, well, amazing...

If it was me I'd go online to http://www.aqua-mart.com/
and get the phone number and talk to Jeff.
He's very helpful over the phone. I'm sure there are other
vendors just as helpful (pond people usually are ;-)

The other thing I would do is cut the fish population
in half. If you plan to do this make sure you mention
it to anyone you talk to.

And hopefully others will chime in here.
(They must all be off looking for those last few
easter eggs...)

kathy :-)