This is my first grow with soil. I have my plant in a 20 gallon pot with 40% Ocean Forest and 60% Strawberry Fields then added an additional 2 gallons of perlite to this mix. The plant appears to be doing okay and I am into the third week of flower. Will this mix take me through to harvest or do I need to add anything like top dressing, or feed the soil or anything? If I do what is the easiestthing?