Hestates that he has been increasing the dose to try and get more red color in his plants. Note that the red color in plants doesn't come from iron. Many people have tried doupling, tripplingng, and quadrupling the iron dose and not seeing any improvment in reds. However I have seen a post were the nitrate dose was reduced and that resulted in better reds.
He also states that some of the leaves are not as wide as he was expecting. A good reason for that is that the recommended seachem dose provides 0.001ppm of zinc. Plants Need about 0.02ppm. Zinc deficiency causes smaller leaves. The same problem also exists for copper. The seachem dose provides. 0.001ppm of copper when plants need 0.006ppm. And for molybdenum Sachem uses sodium molybdate. Sodium molybdate is not compatible with the other sulfate ingredients in the bottle. Making it unavailable to plants.
He also states he has been increase the dose to get more growth. Well even if you triple the dose you are still deficient on zinc. you would have to increase the dose by 20 times to get enough zinc.
Also note He needs 9 bottle of seachem products. IN my experience making my own macro, micr, GH fertilizers you only need 3. I have listed some of the issue I have found with their fertilizer (zinc, copper, and molybdenum but there are others. Seachem dosing guid calls for all of these bottles because they are tying to correct some of the deficiencies in there fertilizers.
My tank uses RO water and an inert substrate. I tried 4 different fertilizer including Seachem and I couldn't get any to work. Most fertilizer companies assume your tap water and substrate will provide some of the nutrients. But I was using pure RO water and I didn't use a soil substrate. so they didn't work. My firstatempt at making a fertilizer was a clone of Flourish but I adjusted all the nutrient levels to get it close to the ballance plants like. and I used a different iron compound. And sodium Molybdate was dosed seperately. That worked very well . I has since started testing a Chelated mix similar to a
new product by GLA. If you get it it (It is a USA companyt)ig would definitely work better than Seacem .trace.
The well water used in the video probably provides most of the nutrients that are not in the seachem fertilizers.