Started the tank about 10 day ago, I've had a rethink about the heat-cable and am using a submersed heater for now.
Water conditions at this time are:
Carbonates 2 kH
General hardness 3-4
I'm dosing very lightly some macro nutrients of a Potassium/Magnesium vitamin supplement made of Potassium Gluconate and Magnesium stearate, with help from some Dolomite gravel as a calcium buffer, mixed with washed river sand capping the stream-clay/sand.
I changed out the old CFL spiral 22w in the clamp-on reflector for a 9 watt, TCP Daylight 60 watt equivalent LED bulb, it seems dimmer than the CFL, but the growth in both tanks reamains the same. Maybe better spread of color and color rendering? The White clouds are certainly looking brighter and more colorful under this light.
I think I like D.I.Y. low-tech LED lighting.
Our water is a surface well source and comes with very little dH or kH, some tannins, and some iron. I never noticed that adding extra iron to our water ever helped boost my plant's growth in the past. Certainly our pond's Lilys and Water Hyacinth grow with vibrant green with nothing more than some dolomite to buffer the very soft water we have.
I'm presently growing out Water Sprite I have in the 5 gallon, along with the C.Parva and C.Undulata I picked up earlier. There's a sickly Anubias Nana narrowleaf I was gifted, I'm not sure if it's going to make it or not, it's only got a few healthy looking leaves.