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Try a sea hare. I used one in my 30 gal and it worked out better than adding chemicals. When he finished cleaning the algae, I gave him to a friend and bout 10 more hermits to keep the algae from growing as much.Thank you for all the suggestions.
In my 30 I rely on snails, emerald crabs and urchins to eat the algae. Small fish just don’t do it. I kept a lawnmower blenny as well as a tail spot blenny and gobies and they just weren’t interested in algae.
A 30 is too small for a tang, so although it’s the best choice, the tang won’t do well. They will outgrow the tank too quickly.
Can I put a tail spot blenny with a yellow watchman gobieI would recommend snails and hermits for algae, However... Tangs, Blennies, Gobys, and many other fish will eat algae. (you could only keep a Blenny or a Goby in a 30g)