However, if you prioritize your angels, the other alternative is to remove the convict and blood parrots and consider getting Discus fish. They can be tricky to take care of due to their essential water conditions, but they can live harmoniously with angels and they are splendid looking cichlids. You could also consider Rams and other small peaceful cichlids.
But this is MonsterFishKeepers and I recommend the larger aggressive American Cichlids
I would advice against keeping discus with angels. The sole reason for this is not comparability or temperaments, but disease. Many angels are carriers for diseases that don't affect themselves or other angels, but can be lethal to discus, who are very sensitive fish.
As stated above, the con and blood parrots will destroy your angels. So rehoming someone is inevitable. Question is what do you want more, the parrots and con or the angels? If you decide to go angels, they can sometimes be kept very well with severum if the severum are raised around the angels from a small size (1-2"). Unfortunately, both the severums and firemouths will boil down to personality of the individual fish as to whether or not it can live happily with the angels. Some are angel killers and others will school with the angels. It's all luck of the draw.
My personal recommendation (not knowing how attached you are to any one fish/species) is to rehome the angels and add the 2 sevs and a firemouth.
If you decide to keep the angels, rehome the parrots and cons. Skip the firemouth. Give the sevs a try, but you may have to rehome someone down the road if they don't play. Start the sevs out small (1-2") and that should greatly help with aggression in months/years to come.
The silver dollars will work well no matter which route you take, but I advice getting at least 4 as they have a little bit of a social pecking order.
Out of curiosity, how do you know you have 2 male and 1 female angel? Angels are notoriously difficult to sex and even master angel breeders often don't know the sex of their angels until they see them breed.
As far as your canister filter question, I would recommend getting one of the top three name brands. Rena, eheim or fluval. All three make good solid products with warranties in case something doesn't work,like its suppose to. As far as size, the AC110 takes care of a lot of the work, so I would shoot for a canister rated for at least 50-60 gallons. Just remember you want the water to turn over 8-10 times in an hour, so you want your filters to have a combined flow of 880-1100 gallon per hour. If you can manager to fall within that set of numbers, your filtration will be fantastic.
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