steup a 15g qt.purchase fish from lfs and they always have ich.i use cupramine with some success.have tried loer sp gr 1019 with some success.what is the best lo sp gr then add cu if ich shows up or start a combination lo spgr and cu.can malachite green be stacked on the cu. i do frequent water changes 2.5 g 2x/week.i also run a hang on filter with copper pads.am i losing all my cu in the penguin filter.thanks beach