I'd have to get a KH testing kit since I only have an API master kit that tests ammonia, nitrite, nitrates, and pH.
Really? I did not know that. Sounds like RO water would be best for my projects. To answer your questions, I'm actually interested in breeding two species, both from South America - the Apistogramma Trifasciata dwarf cichilds also known as Threestripe. I already have two males and a female. I don't know where my second female went. I'm honestly surprised the bigger male hasn't killed the younger male yet. They're in a 40 gallon community tank, which isn't really ideal for breeding, plus the pH always settles at 7.6.
The other species I'm interested in is the Starlight
Bristlenose Pleco, also known as the White Seam
Bristlenose Pleco. I have a young female pleco at 3 inches, not yet sexually mature so I have time to get things together before I attempt my projects. The Apistos will definitely be started first.