I noticed a few post that have info that are debatable. one is with shade leave and removing them. I have done both and cant really say I noticed a difference either way. It is best to wait till half way through flowering to when they are not needed. However, when you think of it in terms of production, the plant dedicated resources to produce those leaves and if left on it will slowly consume them esp during a flush, which I would recommended when doing hydro, if using Soil I always used full organic meaning not using concentrates. I wont debate the topic of leaving the fan leaves or taking them, I will suggest leaving the first go around then trying it without from there on and see which you prefer. I just leave them or grow strains that produce very little amount of fan leaves. Now when it comes to seaweed or seaweed based products, I used them a great deal years ago and noticed that they are great all through veg, however, in flower they tend to cause the buds to lack in density and made them stretch out giving a larger appearance until you go to dry and they shrivel down so much you think some evaporated. I have since then, came upon an article discussing the effects of the different auxin's and the draw backs to using them in flower that has given credence to my personal past experiences. I would suggest avoiding the use of Seaweed during the flowering stage. They work great early on with root development and provide vitamins and all, just the plant hormones seem to negatively effect the flowering hormone causing so effects that are not so pleasant. if you don't agree, that's fine but I would invite you to try it out because the difference has always been night and day.
Furthermore, I have noticed that sometimes saying things contrary to what others think can cause hurt feelings and start arguments. I am not here to argue, I simply enjoy helping others with what experiences I have had during my own journey in the world of growing and I will agree to disagree and encourage all to discover for themselves what works for them. I would also invite someone to look up the article, I don't think it would be hard, my time is short and I would rather spend it helping rather than researching.