Even if you use chemicals to destroy the algae, you need to look at why it became such a problem.
I am thinking even after dosing the tank, destroying the algae and then getting a mantis, the algae most likely will return... There is a cause/effect, what is the cause? That is what you/us need to figure out.
Could you detail your system and hardware for us.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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