Thanks for getting back to me. The Platy's mustn't mind as they have all been born in that water!!! Started out with 3 of them, 3 years ago...and I have about 20 in there now!! There's even a very little one that must have made it through the last births. I was more concerned about if the very low PH or KH would be holding back the plants....or if I should put more Easy Green seeing it went down so quickly. But if it takes 8 to 11 weeks...I guess you think I should just wait until next week and do the 50 % change and 15 squirts again?? IF you don't think the test numbers are a problem...I will just leave them....if it ain't broke don't fix it,,,right?