I have both multi's and petricolas. But they are costly and hard to come by. Alot of regular places never have them at all so you tend towards specialist stores which also tend to be independant.
All factors lean towards higher prices but I do believe they are worth it.
Belle (My multi) has taken to swimming against the front glass in the evening to position herself in the direct current of the external filter inlet. She adores being buffeted by the current.
Petra (a petricola) prefers daylight to night time and has made good friends with the only eupterus in their tank. Arthur, a deformed young fellow whose face has a dent in one side causing his mouth to have grown at an odd angle. He's been kept apart from my community of eupterus since he simply couldn't cope with them and their boisterous ways.
I have to add, as a big lover of all synos in the various forms, I am amazed they aren't more popular and can't understand why so many of the more common types (eupterus especially) get returned as they grow up.
They have such sparkling personalities and quirks that the idea of parting with any would break my heart. Belle now spends time in the evening watching me when the house is quiet. Her tank is next to my bed and she takes great interest in watching me read b4 the light goes out. Funny thing.
Oh I do talk too much.
)
Hugs,
P.
P.S
mithrc if you get fry from your petricolas I would be very interested.
Would love to hear how it goes with them too. They do mature quite slowly and grow the same way.