While I agree with Doug, to a point, its not the Marco rocks fault that people have problems with it. The problem lies with people thinking they can fill their tank 90% with Marco rock and put fish in 3 months later.... I tell everyone that while Marco rock is cheaper, you seriously cant fill your tank with fish for close to a year with large percentages. But this also has a double edge as Ive seen people put 75% marco/ 25% live and leave the tank empty for 6 months, which doesnt work either because you need the cycle to be created.... and after 6 months thinking it shoudl be populated and ready they have algae problems.....
So final note being, in my opinion, Marco rock is fine to save money, but you need to realise you will need to figure out that happy medium to create your cultures, without going over board and getting a bloom..... not for the inexperienced, or trigger happy consumer....
Steve
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