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Need more nitrogen plant is still growing in the first few weeks of flowering so it will pull nitrogen from the lower leafs (yellowing) to support...
you can even clone in a 1: rock wool cube and then when it roots place the 1" cube in soil and it will root out into the soil
either under feeding/watering or over feeding/watering
Honestly for seedlings and clones florescent shop lights work best. Much cooler and cheaper to run. The 400W can burn them if it gets to close....
at this point it is to late to repot and would not do you any good as root growth is not the plants top priority any more is is putting its energy...
just remember the plant will keep growing threw first and second week of flowering so dont let her get to tall if height is an issue
as the plant roots it will start pulling nitrogen from the lower leafs to use for new growth. This is normal if they have had time to root they...
It is up to you if you want to flush them or not it is personal preferance with any nut. Foxfarms BigGrow nad TigerBloom are only 80% organic Big...
Also my only complant about foxfarms is there feeding schedule is very conservative it ususally ends up being almost double to get the TDS into...
I only flood once a day because of the RW cubes. if you were going to just put the 1" RW into the hydroton then i would water as if it was...
I saw them at a trade show by hydro innovations i think was the company they have a you tube of their entire water cooled room lights CO2 gen...
In soil i use white vinager to lower the PH and baking soda to raise it. I use commercial PH up and down in my hydro setup as the baking soda...
if you are using hydroton it has no effect on the solution. There is lots of lose clay dust in the bags and if you rinse it good prior to first...
I have the same set up i use and ebb and flow with hydroton and use foxfarm nutes.. I do my clones in 1" rockwoll and then put them in a 4" cubes...