Green Algae in Food and Feeding Posted September 8, 2010 I was over at a freinds house today and we were out back talking and I looked over at his Koi pond at his waterfall and their was all kinds of green algae growing on it I asked how often he cleaned the algae off and he said every week or so. I was wondering if I let it dry if I could feed it to my Dubia colony. Has anyone used algae to feed their colony befor? I know fish eat it. Curtis Algae may have some anti-appetite factors. Rats given spirillulina had reduced appetites and lost weights. Don't experiment with your roaches.