There is no bad algae, its absorbing nutrients. that stuff is common at faster flowing areas. it;s a thicker slime if you let it . algae is a human thing where we don't want to see it . i only feed my koi once every three days or so they swim around and graze
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.