Step one: Silicone and styrofoam. Lots of it!
Step two: Concrete coat
Step three: Colored concrete coat
Step four: Lots of curing time.
Step five: Wet curing time.
Step six: Pump installed, plant and drift wood placed
Step seven: Fish! I doubt you can see them but there are three tetras in there.
Step eight: buy frog. That will take a few more weeks until I can find the time.