Well, just because you see videos on youtube of someone mixing fish with other things, doesn't mean its ok and will work...& I agree with everyone else whose posted, you should not mix them. Turtles also get really sharp claws and can tear out fish's eyeballs...I've heard many stories of them doing that, so its best not to mix them...this isn't the only reason why I think you should not mix them, there are many more reasons