DIY waterfall in metal can with GEM5® lights and Green Grabber® screen

[SantaMonica]

Metal cans are OK for freshwater and fish-only saltwater systems, and they block all light from escaping, so this customer made a nice DIY waterfall scrubber with 4 of the GEM5 lights in a can, and a mirror on the lid to reflect light back down...

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[Marksfish]

What about rust?

[SantaMonica]

Just adds iron to the water. No corals, no problem.