Quote:
Originally Posted by sphelps
Personally I think your skimmer is your problem, I really don't think a ER 135 is big enough for a 90 gallon + sump system when using Zeovit. Although it may be a good skimmer for the price it just simply will not do what you're expecting it to. Basically you're flooding your tank with bacteria and bacteria food to eliminate nutrients but there are harmful byproducts that need to be skimmed out. It seems fairly obvious to me that skimming has not been effective and these byproducts along with excess bacteria and b-food has resulting in a cyano outbreak.
Although the guide does state that 5% weekly is fine when using RBS it also states this would be for the purpose of only replacing elements. In your case you should change more water to help remove byproducts and excess bacteria and nutrients not removed by your skimmer.
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With sump minus displacement of rock my system is only about 100G total water and I am only lightly stocked so the ER should be sufficient, I would love to upgrade to a BK but the $1000 price tag is holding me back. With the ER and weekly changes I should be removing enough of the bad nutrients to compensate for not spending my mortgage on a new skimmer.
As I noted earlier in exchange for my regular 5% water change this weekend I am planning on doing a larger removal and replacement upwards of 25% volume.