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Originally Posted by NanoReef
i only have 4 fish...im getting a 90 soon. 67 is too small!!!
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Four fish doesn't mean much - Four lions, vs four gobies are two radically different bioloads.
Not all RO is the same, check TDS readings of that water.
You should really have a skimmer, 4 of any kind of fish in a 20g is quite a bioload. A substantial hunk of graciliara, or chaeto would really help you on your way.