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anything can kill your tank bro, especially since it such a small water volume and enough phosgaurd will strip your tank of phosphates, ask me how I know. lol
test like 5 times honestly, I hate API kits lol but I would get some phosguard in a small bag, go with half the recommended amount and test again in 12 hours and then test again after another 12 hours. Phosgaurd exhaust pretty quickly but if you put too much it'll strip your tank.
tank looks fine man, i'd say get the proper test kits. get your parameters stable and just enjoy the ride. growth will come, IME, growth can stagnate then one day, boom, you get a sudden massive growth in everything.
tank is still fairly young, give it some time.
I would actually getting a better Alk test kit then the API. I just don't trust their kits. I also like mine between 7~8 dKh, best way to lower it would be to let it just go down naturally.
fast changes don't bode well with reef tanks.