Without details on your current tank & lights & goals, it's difficult to offer
useful advice
I have a couple of small tanks that are running on "sunlight", another larger, deeper tank that also receives a fair amount of ambient light but nowhere near enough to grow a range of plants (though I suspect that crypts & some ferns might do just fine), another deep tank that receives almost no ambient light (plants quickly deteriorate if I leave for some days & forget to set the light timer, whereas the ambient lit tank quietly waits).
Tall (deep) tanks generally require higher intensity LEDs or T5s (HOT5 complete with excellent reflectors) IF you want carpet type plants
It you intend to leave the Mbuna in the tank, you'll be limited to plants they dislike eating/tasting/shredding
When I lived in an area with hard water, I kept Tanganyikans with limited plants (Valisneria sp, Microsorum sp, Anubias sp), I did weekly 50 - 70% water changes using a
Python system +
Seachem Prime
adding Prime & water directly to the aquarium, all fish thrived & seemed to respond positively to the large water changes BUT my tap & aquarium water was "matched" (large frequent water changes are one way to ensure this, if you're unsure of your tap vs aquarium conditions, then test & check; if your water supply is sourced from multiple reservoirs, then you need to take this into account &
always check water before performing anything more than a 25% water change)
Now my tap is very soft, so I keep fish that prefer soft, acidic water ...