thanks LesleyHi. So glad tank is doing well. I run carbon 24/7. I use seachem matrix carbon. Is fine to be placed in a media bag also. I've never heard of the one you speak off. Personally I would stick with a good quality black carbon. Some of the cheaper ones are made from brown waste carbon & some research suggests may be related to HELLE in tangs. They also release phosphates to a much larger degree than the good quality black carbons.
I am curious. Do you have any fish ? Do you also change water ?I use chemi pure elite in my nano and it works a charm. It removes both nitrates and phosphates and is now my only source of filtration. Works wonders in my opinion
I don't know about other carbons but seachem carbon , once exhausted will not remove anything further from the tank but I am 100% sure it won't leach anything back in.I've always used carbon more as a prophylactic than anything else. The thing with carbon is to remember to throw it out after a day or so as it will release back into the tank.