Cheesy Moments

First grow. I decided to start this diary half way through the grow, so my apologies for the lack of info/pics in the early weeks. 5 x Dinafem cheese auto XXL in 3 gallon pots. I'm using the biotabs starter pack and followed their directions exactly. Two tabs per pot + mycotrex, startrex and bactrex. Soil got a soak with the orgatrex/bactrex solution then sat under the lights for a day before planting. Planted directly into the final pot, all seeds popped within 3 days. All looked healthy except one which was showing some issues (see pic). At the time I thought this was fungas gnats, then I thought it was a PH issue. Now I'm thinking that this plant hit both biotabs in the soil too early and was over fertilised, as it has since recovered OK. I've since seen recommendations to wait until week two until adding the biotabs when using them with autos. I'm not sure about though - as aside from this one small issue they've all had very rapid growth, so I think in future I'll add one biotab to the soil before planting, and add another at the end of week two.