Ok.. so i have a situation. I need to add some urchins asap.. i have a 20 gallon tank that i use as a qt for inverts.. snails hermits ect.. what is the time period to QT urchins.. no fish in this tank.. thoughts please.
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Algae growth in reef tank. Years ago I used urchins to hit the algae and they worked nicely. Have not used them for par 15 years.