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Epsom Salt and kH relation

So basically a dropchecker with 4dkH water with bromeline blue if its yellow it means that I have adequate co2?
 
In that area yes. But it doesnt tell if your co2 keeps climbing during the day for example. This causes algae. A ph pen can tell you this and more accurately. Mainly a ph pen can tell you when co2 is stable and dropchecker cant.
 
Ok....I think I get what you are saying but even if I have a climbing co2....thus throughout the add the co2 in my tank is increased....then why would that be a problem if I am over the threshold when lights are on?
 
Ive seen algae appear if co2 is not stable even if its at or over 30 ppm. When i keep co2 perfectly stable then algae does not grow.
Also its a lot more dangerous for your critters.
 
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