11-04-2009, 12:53 PM
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Your tank volume is 7.58 gallons. The fish you have are going to be the maximum limit for that tank, and as they grow to full size you may find that you need a larger tank for them. Gold barbs average 2.5 - 3.5 inches when full grown, but red eye tetras can get as large as 4 - 5 inches each when full grown.
I would strongly suggest not adding anymore fish to that tank and watch your water quality carefully as these fish grow. Keep up with your weekly water changes, 30% each week, and don't over feed them, and be prepared to move them up to at least 20 - 30 gallons later when they are full grown.
Good luck to you.