For the buildup on the pump -- try using a denture cleaner? When you get there, that is.

I had a customer come in who was going to by a new pump for her pond water feature. We couldn't get her the one she needed, so she tried soaking it in denture cleaner overnight. Said it worked awesome and the pump is running.

I'm sure after soaking it over night, you might want to let it run for a while afterwards to remove any denture cleaner residue.

The setup looks awesome. You'll have some happy frogs when you finally add them.