I'm starting a fresh tank... I have a C. Marulius.... any ideas of something that I can keep with him. The tanks a 600L and he's 13". 2 fx5's and all that. Your ideas would be appreciated. . Cheers
your main problem is that most varients of maruia are going to outgrow your tank very quickly on there own (unless it is overly wide), so you would need to think about an upgrade in the future.
the guys are 100% correct another marulia is really your only option for this tank as marulia can be very nasty again depending on the varient some are far worse than others but only a very small amount tolerate other fish over any period of time .
to be honest a far better option for your tank and esp if you are looking to add other fish would be pleuro or obscura , marulia complex comprises of the longest snakeheads you can find and can grow far longer than even micropeltis.