Sad Windelov

[breeglet]

I noticed my windelov is starting to brown/yellow.... It has lovely green new growth though. Is the new growth just adapting compared to the old growth? (Current old growth is still from the LFS)

Parameters:
5g tank
0 ammonia/nitrite/nitrate
7.6 pH
80* temp
8 drops flourish comprehensive on 1x weekly
10 drops flourish iron 2x weekly
10 drops flourish excel daily
10watt compact fluorescent 5-8hrs daily
3/4 tsp of fluorish equilibrium per 5g, and proportionate dosing with water changes.

Here is a picture, say hi to Felix.

I'm thinking of just trimming back and letting the new growth take over since it looks considerably healthier than the old growth that kind of "belongs" to the LFS setup. Would like opinions.