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I have a question which I do not understand. 4 weeks ago, I setup my salt water tank and cycling began. After almost 2 weeks, ammonia had peaked and dropped to 0 as it should have. Nitrite then became pegged at >6ppm and stayed there for quite a while and this was normal and expected. I did a...

I have 1 50 gallon acrylic salt water aquarium. I am converting it from a general saltwater fish tank to a reef tank. I am changing the old 15 year old under gravel filter to a wet/dry filter. I would like a recommendation on a filter. I have been looking at 2 models. The Eheim 2227 and the...