I'm planning on putting some acros in my tank, and I just want to know if they are difficult to raise.
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Yes and no.
If you maintain stable water quality (pH, Alk, Ca, Mg) and have the proper lighting to ensure they get the intensity and spectrum (halides, T5s, and/or LEDs) they need for growth then they can be pretty easy.
If you aren't doing the above then you're going to run into trouble with acros.

It's the chemistry I have to worry about.
This is the harder part of sps. In a 2 gallon tank, it will be difficult to keep acropora, IMO.
Salinity swings would be a problem in a tank that small unless you use an ATO. The only was I can see a 2 gallon working for acros is if its plumbed to a 30-50 gallon sump lol.
What's an ATO?

