well i have lost 6 of the 10, the couple that are still in there are still going, fingers crossed. Seen a fresh shed skeleton today so it could be that the others were having problems molting, if it were copper or other heavy metals, surely they would all be dead by now, i think it might be a stress issue, i may have shocked them with a water change. Also looking into better lighting, the stock lights just arent cutting it for the HC. the raja and dwarf grass is doing fine but the HC isnt doing great