Hello
N. rubripinnis can be very sensitive to velvet so keep the tank clean. Regarding water movement and filtration, the tank needs a good filter that is not going to create too much current. At no time do the fish want to swim againste a current.
Feeding is straight forward: blood worm, tubifex, daphnia etc.. frozen or live. I'm sure on of the Singapore locals will be able to tell you what foods are available (assuming you are form Singapore). I would do a 25% water change once per week.
For spawning, go see my website where there are a couple of articles lying about....
Your temperature and pH seem fine to me.
Do you know which strain you have?
good luck
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