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mine were in a 75 gallon for a year before i got the 210. did they "argue" a little bit? sure! thats why i bought agressive fish... i like to see them stand each other down.
with proper filtration (a good cycled wet-dry + mechanical) he can support the fish he has. probably not if he feeds them 1000 feeders a week as suggested. fish eat 1x a day or every other day.. and very little at that. an 8.8oz bag of fish food lasts me more than a month.
ofcourse i think his fish will be happier in a larger tank.. or less fish in the current tank.. but just go to a pet store and see how many oscars they have in a 20 gallon tank sometimes...
ive always heard the rull of thumb is 1" of fish per gallon
55gallon tank = 55x1" fish or 10x5" fish or 5x10" fish
yes more agressive fish will want more territory but hes got
1 10" oscar + 1 6" oscar + 1 8" jack dempsey + 1 6" jack dempsey
10+6+8+6 = 30 gallons minimum
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