Good as that hard water will keep the Chromo production down but probably not the Nothos as they are more adaptable. That's the only draw back with killies. They can grow and live well in reasonablely hard water but for really good breeding results they need the soft slightly acid water. Peat will drop it some and if you buy the bushels of peat and research the company's acidity number for that peat -- call their 800 number -- you can get a peat that will acidify hard alkaline water. It takes a peat that reads 4.5 to 5 pH from the company's tests. They know that information. Be careful though, boil it in an enamel pan first for an hour and rinse well in hard water and then use -- as the real acid stuff can plunge the water chemistry and kill the fish. Might be good to get a pH tester and dry run the effect of peat on your water. You can put the peat in a corner filter between floss layers or in an old nylon of your Mom's or a nylon filter bag or just the peat from the breeding container. It is best not to use real acid peat for breeding -- read Morenski's article in the latest JAKA -- as it kills the eggs but acid peat is great for water conditioning. RO is safer and easier though -- usually a 85% RO/ 15% hard tap water mix down slowly over several days is this best. It's not real expensive when you just use some for small breeding tanks. You will see egg production climb in Chromos. Don't let the stores trick you into buying products to make hard water soft. It's either peat, rainwater, RO water or DI water -- unless you have soft tap water.