Do I understand correctly that gh and kh are only important if you have plants or want to breed fish? I have all plastic plants and don't plan to have little fish babies. When I did the 5-in-1 test strip, I saw that the KH is 180 and hardness is 300. In case it matters, pH is about 7.8. Nitrite and ammonina are 0; nitrate is < 20. Should I be concerned about gh and kh?