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Kalk paste via baby medicine syringe for the ones you can reach, Copperband, file fish for the ones you can't, relax.
Aptasia is unavoidable. Not only that, but matt had told me TSM runs their coral systems with no fish because their customers insisted on it. customers were scared of fish...
I use read sea blue bucket, mixes around 7.7-8.2. Right about where I keep my Alk.
I switched from instant ocean for the same reason you're thinking about doing it
https://www.amazon.com/Inkbird-Temperature-Controller-Thermostat-Waterproof/dp/B08VNRJRKY/ref=mp_s_a_1_15?crid=EPYGKKLEZCVV&keywords=inkbird+temperature+controller&qid=1654635824&sprefix=inkbird+%2Caps%2C76&sr=8-15
I bought this inkbird when I put this frag tank specifically in anticipation for...
Not all of them are benign like that. Most sponges in most peoples tanks are benign. Sometimes you get a less common situation where it becomes a serious problem