Sorry I have not kept this one up with all the changes but this will be the last post. I haven't seen a cardinal in over a month. They say the best thing to do to a shrimp tank is to leave it alone. I think I messed with it too much. I did several rescapes, changed remineralizer several times, turned heater up and down a few times, messed with light intervals and in turn reduced algae they fed on. The tank was any thing except consistent. At one time I had berried cardinals but never saw babies. Today I started to remove rocks and plants preparing to remove the neos, no sign of cardinals.