I agree blue throats need a bigger tank. However they and cross hatches are planktivores in the wild and thus the only reef safe triggers. I still wouldn’t do one in that size tank as like hank said they get large
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20 Gallon SPS reef
29 Gallon FW "fat catfish" tank
20 Gallon Long Dart Frogs "Zig" and "Zag"
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