I don't think you will be able to water every 3 days all thru the grow...as the plants grow, so do their needs. Weed likes to get soaked when the soil drains good and then almost dry out before watering again...thinking you can just water a specific amount every 3 days will get you into trouble down the road...water and feed when they need it, and not before!
TANKJR Reviewed by TANKJR on . Questions on New Garden I had 12 seeds come up between 6/1 and 6/2 using small dixie cups (3 oz size). On 6/5 transplanted to 18 oz plastic solo cups (the roots were twice the size of the plant above soil line). Used an ice pick punched three holes in bottom for drainage. After transplanting plants soaked them very well. Soil using Vigoro All Purpose potting soil (supposedly feeds for six months; I'm sure it's fine for first two weeks). Lights have two old 40 watt tubers with 40W/6500K/2325 Lumen bulbs. Plenty Rating: 5