What are your parameters at? Ammonia/nitrites/nitrates/temperature ??
Is the one pump enough flow for a 30 gallon with no crabs? I'm sure there would be some pockets you can't see full of detritus and algae
Perhaps your existing fish are used to a possible imbalance, and new fish are dying from the extreme change???
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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