dont freak out about it kiddo. both my aro's have scars, my neighbor down the street has scars, delgado has scars. u needa spend more time with ur aro, mine is so tame it is no longer jumpy at all. i can have my hand in the tank n she will swim through my arms jus for fun. my smaller aro tries to "match up" to the bigger one, it used to be super jumpy til i put them together.
lol. My girl freind gets pissed at me b/c when shes over all i do is feed her and pet her. She lets me pet her its the barbs i think that jolt her(you know how tinfoils do that random dart!). B/c i nvr sere her jump I just hear it. Only time i see it is when im cleaning the tank and changing water.