New reef tank! 41 Gallon Fluval Osaka. Suggestions?

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*UPDATE*

It is a Fluval Osaka 41G

30lbs argonite
15-20lbs live rock (About 30lbs of lava which I will be removing)
2 powerheads:
Active Aqua pump 250GPH
Laguna pt 8100 80GPH
A Current USA SunPod 250W MH Fixture
Aquaclear 10 submersible heater 50W

5 scarlet hermit crabs
8 blue legged hermit crabs
2 pink turbo snails
Brittle sea star
2 paradise snails