well that 1" per 5G at least as i have heard it, its just a guideline, some fish eat more or are more messy eaters, but as a guideline its not to bad, its not accurate but just good for the health of your fish and so you dont raise levels to much but back to the fish, your tank is very very new. 2 weeks is just the time it took for your tank to finish its cycle, when you said you added the fish slowly, you mean you added them all at once? but just slowly? or just added fish over those 2 weeks slowly? im assuming your PH is not 0, you have very little live rock in your tank for bio-filtration. another thing is that mixing damsels are said to be a no-no because they are very aggressive towards each other. and your fish need room to swim and also room for territory. youve made some mistakes but thats ok, just learn from them, and progress from it. read up alot more and try and get rid of at least half of those fish.
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