OK, so I have had my 6" Motoro now for 2 weeks...shes been eating fine (frozen Krill and siversides). Filtration 1 FX5, 2 aquaclear 110's and 1 big powerhead for extra aeration and flow ...I decide to decorate her tank a little bit (my 220 gallon with about 1/2 inch of small rounded gravel).....so I add a few nice lookin rounded river rocks (6-inches and flat) to one side of the tank......she wont go near them, and is now burrowing under the gravel....she eats, but not a s much, and is now breathing heavy....The rocks were used in other aquariums, and I soaked them for several days in clean water just to be sure they were clean......all parameters are OK, Ammonia = 0, nitrites = 0, nitrtates = 0...temp 81...tankmates all around 3" are 2 silver dollars, a koi and an oscar.....non of her tankmates bother her at all.......she will eat a couple fish and/or krill, then immediately bury........so am I just being paranoid, or is she stressed by the "presence" of those scary rocks!!??.....I am also wondering if it could be parasites!!??....I guess I am ready to remove the rocks (to see if she stops her psycho behavior), thats the only thing I changed this weekend......any suggestions??....I am also paranoid about parasites, as I have seen really small "worms" (like 1/10th inch) swimming in the airbubble from my filters, and I saw this in my arrowana tank also last night....I dosed the arowana tank with coppersafe, and was gonna do that to the ray tank also....is coppersafe Ok for rays.....I have read about other treatments that you guys have used (Prazi?) but it sounds like its nasty....I was gonna try my old reliable parasite med, coppersafe....thansk for any answers guys!!