08-26-2010, 04:17 PM
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Extremely over stocked.
I have to differ with Byron although I have a caveat with my difference. While the ones you have I would not mix, the oscar and dempseys will destroy anything later in life that isnt their size or bigger, some Africans can be mixed. Now the caveat comes in as to where the fish literally come from, not where their wild grandparents live. Many fish are farmed here in Florida and our water is pretty high in PH 8.3 and pretty hard. I do African water straight out of the tap with minor enhancements. Many south American fish are the same way though. My neighbor breeds and raises mass numbers of discus in dechlorinated tap water. Crazy, heretic, shun the non-believe,r and all that but yes, he is a commercial discus breeder with 8.3 ph tapwater in his tanks(and my planted tank as well, they are all staring at me wanting more food as I type this). A couple of the younger ones seem to find my school of asian raspboras to be amazingly interesting. In tanks in the past I have had frontosas, peacocks and yellow lamps with angels, clown loaches and silver sharks and had zero issues with aggression or water issues. Why? Because aside from the clown loaches(which I do not think are farmed, dont quote me on this though) the rest are farm raised here in the US, many in the same geographical area. They are also relatively well behaved fish iin general as well which helps(angels can be antsy).
As for more aggressive members from each continent, I think the size of the south american bad boys would beat the snot out of their African brethren and would not advise adding anything more to your tank for what you have will already outgrow it.