01-22-2013, 08:19 PM
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Do all that
Any surface area in an aquarium thats established etc will carry the bacteria you need to bump the cycle process. Add plenty of live plants, floating too like water sprite etc and maybe even go with a bottled bacteria bottle and you should be there in no time.
Mixture of old and new gravel works fine as it will colonise from one to another. Do you need to take out half though~? You dont want to suddenly strip all of the bacteria out of a tank with fish in it and casue a mini cycle. Normally people go for some ladies tights filled with old gravel placed into the tank.