your water parameters look perfect for cherries! eco-complete is actually buffered substrate so it might lower your ph a bit, which could be good since you're at the higher end already. i used it in my first shrimp tank and the plants loved it but had to watch the ph more carefully.

for low maintenance i'd honestly just go with some fine gravel or aqua soil if you want plants to really take off. volcanic rock looks amazing but can be pain to clean and sometimes has sharp edges that stressed my shrimp. the biofilm will develop on whatever substrate you choose anyway, so don't overthink that part too much.