02-26-2010, 03:49 PM
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1) Sometimes bettas will eat the neons and sometimes the neons will nip the betta's fins. It's a touch-and-go thing. You will need a 10g tank to have room enough for both species, since neons nee to be kept in a group of 6 or more.
2) 4.5g will be fantastic for a betta. It allows room for a filter, a small tankmate ie a snail or some ghost shrimp, andyou can heat it safely (most heaters will cook water in a volume of under 1g). Furthermore the large volume of water makes dissolved waste ie ammonia more dilute and therefore less toxic. In a larger volume of water, pH, temperature and other water parameters will also be more stable and change slower than tthey would in, say, a 1g.
3) Feedings are good. Make sure you are feeding a staple of pellets as bettas are extremely prone to bloat and therefore sensitive to foods that swell up with water in the gut like flakes or freeze-dried. Supplemental live and or frozen feedings will stave off boredom and enrich your bettas diet.
I suggest you check out our forum specfically for bettas, found Here