no. im going to make the assumption this is less then a 100g tank. prolly around a 55g.
oscars are not that aggressive for their size. jaguars on the other hand, are viscious.
for each large cichlid you should have about 55g's of water alone.
for the 4 jags and 2 oscars, i would say you need 300g tank MINIMUM. the convicts will prolly get eater by the jags but they make good target fish for the mean time while they are the same size
You are not making an assumption here. You are making a judgment! That's not the kind of answer (or attitude) you treat a person with after their first post. For all you know their tank could be bigger than your house. They need help for crying out loud.