Well, I have been doing a fishless cycle and I must have gone awry somewhere.. My ammonia and nitrite levels are 0, but my nitrates are sky high! My ph is at 7.8. Some  of the leaves on my zukes and strawberries are brown and drying up and I even seem to be killing my marigolds. I purchased my blue tilapia and they are inside in a tank because the tank outside is hovering around 66 degrees. A…