should i wait....or start fert...i've fert from rootmedic i bought while back liquid and capsules.
To answer your questions in very specific terms, then we truly do need more information.
please provide full detail about your setup, co2, ferts, lights, filter etc.
To ask if you should start fertilizing now or not is like asking if you need to put more gas in your car. We can't possibly answer without knowing more details. As long as we do not have those details, the most we can offer are basic guidelines. So on that note...
Fertilizers do not harm tanks so there's no reason to not
fertilize now. As long as you continue a 50% water change each week, you should be okay.
If you run into a problem, then we can help you which may entail a change in your fert dosing because problems are symptom which give us clues as to what's missing or in excess. Otherwise, we just don't worry about it.
So add ferts now or later, whichever you feel most comfortable with. If your plants look like they're growing as healthy as they possibly can, then maybe they're okay as they are. If not, then maybe you should add ferts now. If there's anyone or anything that can tell you what to do, it's the plants in your tank. Listen to them, and they'll tell you what to do.