My platy couple has been just hovering in place, rather than swimming all over the tank lately. The boy platy was introduced to the girl about 1 1/2 weeks ago. The first couple of days, the boy platy was hiding most of the time. Then he started chasing the girl platy around for about 2 days. Ever since then, both are just kind of hiding and hovering, not swimming around. Anyway idea what the problem might be? I set the temperature to be 75F. The tank has been going for about 4 weeks now, should be fully cycled by now, right?