Several questions I hope everyone can help answer the water change

　　

Several questions I hope everyone can help answer the water change

1.Changed a new house (happy) No place to be trapped in water The house is so small.Finally, the fish tank is arranged! Can I use the RO water purifier to directly feed water?In addition, the temperature is not added. But you can enter less every day. Is that okay!2.Can the 1800*600*900 fish tank reproduce?. Now one male and one female.3.Is it better to change 1500*800 than it is now!?

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