had both of them in the past. right now i have a blue lobster left. he just chills in the sump of my filter with his goldfish friend. i find it quite funny cause i put that goldfish that my brother won from a fair and then afterwards i put in the lobster. he never touched the goldfish and my brother's friend brought over a bunch of goldfish that he didn't want anymore (all goldfish are feeders btw) and so i threw them all into the sump and only my brother's goldfish survives. and also no matter how hungry the lobster gets he seems to leave the goldfish alone.
the blue crayfish is a really striking looking fish but the only problem is you can't really have any plants or tankmates for them. same with the lobster so unless u want only that one type in ur tank i suggest not getting them.
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