Hey, welcome to the forums. I agree with the above you are going to have a very messy blood bath once the fish begin to mature. To keep all of your fish you are looking at probably a 800g++++ tank I'm not sure how long you have been in the hobby but there's a website called aqadvisor. It's not always accurate and shouldn't be considered 'the law' when stocking tanks but it's a good rough estimate here is what happens when we put your stock in a 300g tank. (Without the Umbee and the red tiger motague because they were not listed on the website).
- Note: Oscar may jump - lids are recommended.
- Warning: Rainbow Cichlid may become food for Oscar.
- Warning: Wolf Cichlid is not recommended for your tank - it may eventually outgrow your tank space, potentially reaching up to 24 inches.
- Warning: Salvini Cichlid may become food for Wolf Cichlid.
- Warning: Rainbow Cichlid may become food for Wolf Cichlid.
- Note: Rainbow Cichlid should have a good source of green algae in their diet and do best in planted tanks with soft substrate
- Warning: At least 8 x Rainbow Cichlid are recommended in a group.
- Warning: When Oscar starts to breed, they may become too aggressive to co-exist with Rainbow Cichlid.
- Warning: Red Devil Cichlid is too aggressive to co-exist withRainbow Cichlid.
- Warning: Red Terror is too aggressive to co-exist with Rainbow Cichlid.
- Warning: Rainbow Cichlid may become food for Red Terror.
- Warning: Your selected species may eventually require 324% of your aquarium space. You may need to deal with territorial aggressions later on. Try removing some of (Astronotus ocellatus, Rocio octofasciatum, Blood Parrot, Parachromis dovii, Herichthys cyanoguttatus, Cichlasoma Salvini, Amphilophus labiatus, Archocentrus multispinosus, Flowerhorn, Andinoacara rivulatus, Cichlasoma festae) or get a larger tank.
Warning: Water temperature requirements are not fully compatible between all selected species.
=> 22 - 27C: Oscar
=> 22 - 30C: Electric Blue Jack Dempsey
=> 22 - 30C: Jack Dempsey
=> 21 - 28C: Blood Parrot
=> 24 - 28C: Wolf Cichlid
=> 22 - 30C: Texas Cichlid
=> 22 - 27C: Salvini Cichlid
=> 23 - 33C: Red Devil Cichlid
=> 22 - 28C: Rainbow Cichlid
=> 27 - 32C: Flowerhorn
=> 20 - 24C: Green Terror
=> 25 - 28C: Red Terror
Warning: Your selected species may eventually require 324% of your aquarium space. You may need to deal with territorial aggressions later on. Try removing some of (Astronotus ocellatus, Rocio octofasciatum, Blood Parrot, Parachromis dovii, Herichthys cyanoguttatus, Cichlasoma Salvini, Amphilophus labiatus, Archocentrus multispinosus, Flowerhorn, Andinoacara rivulatus, Cichlasoma festae) or get a larger tank.
You have several glass bangers that are known to be ferocious, the Umbee, Salvini, Jack Dempsey, Green Terror, and Flowerhorn stand out but the others are equally aggressive other than the oscars(sometimes). With 324% overstocked without two large fish..that means you're gonna need at least a 800g tank and since these are very messy fish you're going to have to have a very good filtration setup.
I have a green terror, she grew up with a severum, firemouth and Oscar. she tolerates the first two but killed the oscar which was 2 inches larger than her. I cannot add anything new to her tank. She vehemently attacks any fish I add and does not let up until I manage to get the fish away from her and into a new tank.
I would recommend keeping the oscars and returning everything else. If you're serious about the 300g you're probably going to have to rehome 3/4 of your current stock. Aggressive fish are beautiful but they are a handful and should not be taken lightly.
