congratulation, u know some day i'll have the room for a tank like that or bette jajaja,
i guess we all face these sindrome... the biger the tank , the smaller it looks for us,, doesn't it?
Yes I do have an umbie (Herichthys umbriferum)
(about 11") but keep him in a 180 with an 8" electric catfish (Malapterus electrus)and a 8" fossilis cat (Heteropneustes fossilis). I find the big Dovi (Herichthys dovii) that lives in the 15k does not like the other 3 biggest cichlids namely the Umbie, peacock bass (14" temensis which I got from Neoprodigy and keep him in a 225 with a small 22" annectens lungfish (Protopterus annectens) and a Boulengerochromis microlepis 20" plus which I keep in a 800 with a couple of 18" cuban gars (Atractosteus tristoechus)
and 2 20" to 22" female stingrays (Potamotrygon motoro)
Since the Dovi is getting on in years I don't want him to have any additional stress and fighting.
He presently acts as a godfather to a pair of 12" red devils (Herichthys citrinellus) whenever they spawn (every 2 to 3 weeks) and helps protect the eggs and new born babies from the brycons, stingrays etc. It's amazing to witness he really thinks he is one of the parents and they really need his size (over 20") and muscle to protect their swarm of babies.