Sounds fun!! I agree with keeping your shrimp bloodlines pure. I have blues, orange, red, and black in the same tank, and now most of the offspring are either grey, or black (I just use them for algae control). I also started with sunset platys, 4 F and 2 M. After a year I probably have at least 200 in my 3 tanks, and I don't do anything to prevent predation of the fry (tankmates are ember tetras, neons, neocardinas, peppered corys, and amano shrimp). I still see new fey all the time.
The main tank is a 40 gal cube, high tech, densely planted tank. The main plant is rotala rotundifolia, which grows like a weed and forms dense mats, where I am sure that the fry use to avoid the main predator in the tank, the adult amano shrimp.
I see from your pics that you have a bundle of rotala already. Get 2 inches of some decent substrate in that tank (NOT SAND), a good light, and maybe some nice clumps of Java moss and you should be good to go. Keep it simple at first, just guppies and shrimp. As things fill out and a few batches of fry are dropped, add some tankmates that aren't prone to eating the fry or the shrimp larvae. Before you know it your tank will be bustling with life.
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This was from March. Please excuse the small clumps of BBA. It's been an ongoing battle in all my tanks.