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Oh wow that is extremely overstocked. No pleco has an adult size that is appropriate for an 8-9 gallon tank. Angelfish need a 20 gallon tank, and goldfish are cold water fish that should not be kept with tropical fish and they need a 30 gallon minimum.
Because you have so many fish in such a small tank, your water parameters are going to be very bad. And your fish will be stunted. If they live very long. You really need to rehome all of those fish except the guppies and the snail :/