I confess I haven't checked the pH levels in a while, but the last time I looked my tank was at about 7.5. There hasn't been any ammonia since the tank finished cycling. As for water changes, I change between 25-33% of the water in my 10 gallon tank once a week.
The rainbows are fed TetraMin granules and freeze dried bloodworms. The corys get Wardley brine shrimp pellets and Bio-Blend bottom feeder tablets. I would guess I feed the rainbows two or three times a day. Occasionally I will feed all the fish tubifex worms.
I have not noticed any changes in their behavior lately, but the praecox males have always chased the females around the tank. I have seen them displaying to the females with no success. Is it possible the female was bullied to death by the males? Both males and females are fully grown, and the males are now significantly larger than the females.
But as of this moment, all the fish seem happy.
Of course I thought the same thing when I left the office last Friday.