HI

I have a little issue with my new Neos, I noticed yesterday yellowing of some of the leaves that starts at the centre of the plant, They have only been very lightly fed so I am wondering if they are hungry, the other possibility is too much light but I dont see that as they are about 2 ft away from a south window with a net curtain. My main question is can I feed them with seaweed mix, my husband believes that it can harm some kinds of orchids so wanted me to check before I went ahead and gave it them, it would be at a diluted strengh as with general feed. I dont have photos just now but can try, its difficult as I said the yellowing starts in the centre of the leaves, otherwise they seem happy and fingers crossed I have two flower spikes forming ( cant be 100% sure as this is my first Neo experience)