brown jelly disease in my frogspawn, maybe?

[fishkeeprian]

Hi I fragged my frog spawn a two or three months ago. The frag has two heads the colour is green tentacle's with purple polyps. I have noticed over the last two weeks the coral is going a brownish colour, from the inside, there is no slime etc and does open every day but compare to the mother colony it doesn't look right, is this how brown jelly disease starts? I tried taking a photo but it doesn't really show the brown and visually it looks ok, any thoughts?

Thanks Ian