Well, it might work for a very short period of time but even now you are overstocked and are going to have trouble keeping your nitrates down.
The Dovii will need it's own tank soon. Just be ready otherwise it will make it's own tank by murdering everything else very quickly. Once you remove the dovii don't be surprised if the red devil has to be removed. It may or may not work long term, just depends upon the fish. Now for the bad part. A pacu and RTC have zero business in your tank. You will probably need a 600g+ to think about housing them for anytime. If you cannot provide this for them you need to start finding them a new owner that can ASAP. Your 12" RTC will be 24" in no time, then 36" and so on. I hope you planned for this when you purchased it.
The Dovii will need it's own tank soon. Just be ready otherwise it will make it's own tank by murdering everything else very quickly. Once you remove the dovii don't be surprised if the red devil has to be removed. It may or may not work long term, just depends upon the fish. Now for the bad part. A pacu and RTC have zero business in your tank. You will probably need a 600g+ to think about housing them for anytime. If you cannot provide this for them you need to start finding them a new owner that can ASAP. Your 12" RTC will be 24" in no time, then 36" and so on. I hope you planned for this when you purchased it.

