Well, To be honest, I did not know there was a low tech or a high tech way. Which would be easier for someone to start out doing?
So far as fish. It depends on which tank ill be allowed to have. If the 75 is allowed I would like to do rainbow fish if they are good with plants. I know they are expensive, but I have always wanted a tank full. The 56 will probably just be whatever, maybe a community tank. It use to be cichlids, but I'm done with those crazy things! I do like semi-aggressive fish like barbs so who knows. I am sure there are some fish you want in a planted tank and some you don't. I'll have to research that. The 20L I go for smaller species of fish, like Crystal/Sparkling Gouramis, or other small tank fish. I kill guppies for some odd reaso... 0_O the 10 gallons I usually just do a betta and some shrimp (I've never had a betta attack them before...but I have been told they will) I also had peacock gudgeons in the 10G before those were fun.
Anyway. I have one Finex Planted 24/7 light on the 75, but I never tried to program it. I see where people program them on here, and some have two of them on their tanks. I wonder if ill need two. the 56 gallon is a cube, so it's going to be difficult to light because of how tall it is. Lots of reading.. it's so difficult to keep from getting overwhelmed! SO, I'm starting with lighting and going from there.