Hi! I'm going to hang up a wall aquarium and want to make sure it is securely fastened. Although the load per screw isn't very high (about 30kg distributed over 6 screws), I want to check with knowledgeable people first to feel more confident. I initially thought it was a drywall, but it turns out it's 26mm (I think) of drywall and then concrete directly behind it. Are screws of this type http://www.se.hilti.com/holse/modules/prcat/prca_navigation.jsp?OID=-22966 what I should use? Because it feels like a regular screw + plug will not penetrate far enough into the concrete to hold securely..
