so my 125 gal. tank has just been converted to an amazon tank. it has eco-complete sand substrate that makes the water soft. it has a couple pieces of medium sized driftwood with a new fluval fx5 cannister filter. it is planted as well. so far the only inhabitants are 3 hujeta gars and a retic. stingray. (who hasnt eaten yet). i would like to get tankmates in a few weeks after the ray has gotten used to things. a juvenile cichla mono will be added in a couple months after he's grown up a bit. any other ideas for amazon fish that are passive enough to go in this tank without gettin eaten?