I lost a small Exacto #2 blade in my rock work and can’t locate it. Exacto rep told me it’s composition is 100% aluminum. Very small blade. Mixed reef,sps dominant, bare bottom. Did a cursory exploration by moving some of upper level aquascape to no avail. Employed magnetic search, nothing. IS IT SAFE TO LEAVE IN TANK? IF NOT,.... WILL I DO MORE HARM BY DISASSEMBLING ROCKS AND DISTURBING CORAL IN ORDER TO RETRIEVE? Hopefully it’s ok. What’s your opinion? 13 hours in. Thank you in advance. Dan.