Tin foil in a tank

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When I had my lobophora outbreak in the old tank and now some aptasia in the new, wondering what detrimental effects a few peices of tin foil would have.

Thinking, could mold some tin foil over where the LR where the aptasia are to block off light and hopefully starve then. Yes, would be unsightly but only try it for a short period. Probably need a week or two (how long can aptasia last without light, how long does it take to ship LR as survives that?).