Hi there,
I wish i could have something positive to say about my experiences with these fish.
They can grow up to 8 inches Plus.
We had had a 5 inch one and he seriously terrorised my plec. I mean, i had to take him back to the shop, as he took a chunk outta the plec finage, the plec was bigger than him!
OK, well. These are my dream fish. But i am waiting until i get a 75gal + tank to get one. I will house him with Afrcian cichlids and maybe, if enough room, another syno.
They are very terratorial and you need to provide alot of hiding places if you have similar bottom dwellers.
He will need a cave to call home and some dim lighting if you wish to see him during the day. They are nocturnal.
You can see the pics of my old one in my sig.... he was very nice.... (apart from his temper).
IMO unless you have a 50Gal + tank, with no plecs and relatively few similar bottom dwellers, i would leave it.... honestly.....
IMO they are too terratorial in a 30Gal (mine was a 35Gal)...
HTH