Nitrates are below 20 but above zero good according to the test strips. Is such a high ph of concern or do most things adapt? If I'm reading right with the high alkalinity I am going to have a hard time lowering it if necessary. RO is not an option at this time. This rank has been set up a very long time, has weekly to bw water changes a hob filter and what I would consider a pretty light fish load. My focus is on growing plants and want to make sure parameters are ok before starting DIY co2. Thx.