I put some of everything in all three places. The azteca are much smaller than rhe gammarus. I'd guess the gammarus are from 100 to 1,000 times heavier. The azteca must be very young. When fully grown, azteca are about half as long as gammarus. I put them in separate tanks. The tank with the azteca looks like it's empty, but maybe before long they'll get big enough and numerous enough to see that there's something in there.
