Hi there Ted!
Welcome to simply and very nice set-up you have there. I wouldn't be the person to preach to you on how to keep heckels, thats Heiko's job. Also, I will mention that if you haven't read his book, he will tell you to buy it and read it.
One thing that I do know from reading and others suggestions is that a heckel biotope would consist of a sand substrate bottom, driftwood and floating plants on the surface. I know that the temperature of the tank should be around 82F. Other than that, others will fill in.
Take care and enjoy
Eddie