Well are your leaves turning yellow cuz then it could be a lack of nitrogen in which case i dunno what to tell u if you are flushing your plants now and dont wana use fert. Maybe dilute some of your pee [and when i say dilute i mean REALLY DILUTE it in water] the ratio of nitrogen in pee can be really high so diluting is very important but thats just if you decide you wana add some nitrogen...throw some pictures up so we can see exactly whats goin on