It depends entirely wich species you have and more: what tankmates?
the true L cyclurus is incredably tough! to kill one you would need a club or another bigger cyclurus
they are fiercely territorial and if they don't match (say a male and female) even a 132G with plenty rockwork simply is too small......
for example: I worked my way thru 4 pairs before I got a matching one; now I finally breed the cyclurus.
P typus is a difdferent ballgame. they're territorial to each other (esp adult males) but not so bad fish get killed. given room and plenty caves you can easily keep a group. this is better too, somehow they like and need the interaction.
A solo cyclurus is a happy fish, a solo typus is not.
P typus has one disadvantage wich recently cost me my breeding pair

it is MUCH more suspectible to foodcompetitors than the Lophio's and I made the mistake of putting mine back in the showtank with 14 adult Synodontis. (granny, polli, petricola). that costed me my breeding male. I traded the female to someone who already had a group.
now I'm on the hunt for new breeding material. and in the process of splitting up the Syno-herd; spreading it out over several tanks.
both species do eat small fish when adult. small shellies (for example female multi's) that forget to sleep deep in the shell and halfgrown sandcichlids like 1-2" Xenotilapia are fair game!
The Lophiobagrus brevispinis is the tiniest Claroteid in the hobby and also the smallest catfish from Tanganyika available. this one can be kept in small groups, despite the occasional shuffle between adult males. in a roomy tank 2-3 pairs should co-exist.
my definition of "roomy" starts at 100G mind! a 50G breeder is NOT a "roomy tank"
