Hiya
In regards to carbon, Claude developed Ultra CarbL this is lab tested not to have any impurities. the other important thing with carbL due to the way it is processed the carbon last a lot longer than other carbons of similar quality on the market and as such cuts down maintenance times and costs in the running of
Here is the blurb
Ultra-Carb L is an acitvated carbon specifically made for permanent and long-term use.
Extremely pure, vapour-activated and pre-washed activated carbon for efficient removal of yellowness, turbidity and harmful toxins, essential for maintaining good water quality in any aquarium. Ultracarb is almost entirely free of phosphate and has an extremely high capacity. Ultracarb is specifically made for permanent and long-term use but should be exchanged every 30 days. Suitable for freshwater and marine aquaria, cleans the water without any negative side effects.
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