

I will admit I was hoping for some cichlid tankmate options, but what you're saying make sense. I will probably just keep them in their 40 breeders as pair rather than waste a 6' tank on 4 small-medium cichlids.
You mentioned males being aggressive with females. Is there a way I can reduce or eliminate that in a 40 breeder?
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I found once cutteri started spawning, the male had quite a growth spurt and bulk up, and though not large in the way some Parachromis are large, my male hit a good 7" length, and 5" tall, so by no means small. And together with a pair of panamense, I would think would be striking display in a 150, especially in regards to the contrast in the 2 species coloration, and panamense can also reach bulky proportions.
And an adult pair a bit large for a 40, especially if trying to go for the suppression of male/female tension.
A cave the female can wiggle into, but too small for the male, could do loads for saving her life
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Sevs would work as long as they were of a good size. I'd also consider heckellii & uaru or chocolates.
You might want to just stick with the two pairs mentioned and other some other non cichlid target fish. I've had cutteri spawn in my 300 and they claimed half of the tank. Panamensis will likely do the same.
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Everything I read about Heroina said they were small and mild but I've found it to be mostly inaccurate. My males are in a 210 and they've turned into bulky 6"+ fish that attack my 11"+ Atabapo severum pair when they're spawning.
Although pairs form very strong bonds, males can get pushy if they have a disagreement about the fry or if they want to spawn and the female isn't ready. Given their similarities to Cryptoheros, I would assume the same could be said of Cryptoheros pairs. Even though they are a compatible, bonded pair, there's still a chance for them to have a disagreement. The smaller the tank, the more problematic that may be. Give the female a small space to escsape into.
My best luck with the Heroina is to give them a bigger tank (one pair in a 55, multiples in the 210) with some tankmates to strengthen their pair bond. They rarely turn on each other if they have some third wheel to take out their aggression on. Big, sturdy dithers would probably be a good choice. I like deep-bodied tetras or maybe some big wild-type mollies as duanes suggested livebearers.

Everything I read about Heroina said they were small and mild but I've found it to be mostly inaccurate. My males are in a 210 and they've turned into bulky 6"+ fish that attack my 11"+ Atabapo severum pair when they're spawning.
Although pairs form very strong bonds, males can get pushy if they have a disagreement about the fry or if they want to spawn and the female isn't ready. Given their similarities to Cryptoheros, I would assume the same could be said of Cryptoheros pairs. Even though they are a compatible, bonded pair, there's still a chance for them to have a disagreement. The smaller the tank, the more problematic that may be. Give the female a small space to escsape into.
My best luck with the Heroina is to give them a bigger tank (one pair in a 55, multiples in the 210) with some tankmates to strengthen their pair bond. They rarely turn on each other if they have some third wheel to take out their aggression on. Big, sturdy dithers would probably be a good choice. I like deep-bodied tetras or maybe some big wild-type mollies as duanes suggested livebearers.