i thought something was beating the JD too but it's been like that for the past like 3 months and i haven't seen anything bother her so i guess it's just there,the o's where in a 45G for the first 3 months i had them,they where only 1/2" when i got them, then i moved them to a 120,then that started leaking so to the 110 they went which is now where they stay
the O's get a varied diet and are WELLL fed so i guess that accounts for there bulk,plus i do big water changes,