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If you test are alk exactly the same time tomorrow you can see how much you use in a 25 hour period. So start point is 8.6. If tomorrow you are at 7.6 than your tank uses 1dkh per day.
Interesting. I never new they can fully flip back to being a female. I thought once the transition happened that was it but they can end up in a "washed out phase". I know in the past basically all the dwarf angels were comming in as males already. Females tend to be less colorful and...
Unless you plan on breeding dottybacks always just keep 1. Personally they are a super aggressive fish and equally as destructive as a damsel. Basslets are definitly more docile but you need a lot caves and caverns. Probably not a good idea either unless.you have a very super large tank.