Hahahah, another puffer that i used to own...
The palembang is going to be a real gamble just like your fahaka eventually will be depending on his current size...
Palembangs by nature are piscivores, and therefore if opportunity arises, and hes big enough to, MAY take a bite of your fahaka...
But at the same time with them (palembangs) being quite sedentary, if you have a complex enough setup they might be okay for a little while, but i would strongly advise you to keep a close eye on both fish incase either one turns vicious...
I myself used to keep a few dithers with my palembangs, but as long as he was well fed, he stayed in his cave 99.9% of the time, and never bothered the other fish unless they swam right in front of his mouth... At which point he would slowly move forward to try and target the fish, but never really lunged at them unless they stayed there for too long...
The female i had was slightly more active, but again, unless the fish was hanging out in front of her, she didnt really lunge at the dithers unless she hadnt been fed a few days...
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