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Oh! Great idea! ThankyouYou can use a old gift card. I wouldnt trust it if is smells bad.
Hi! I use the gift card now…it works like a charm. I’m not taking any chances. Thanks for the feedback thoughIf I were going to use a sponge, I would THOROUGHLY rinse it first. Many of the ones I buy suggest rinsing for 1 minute before using. If that's the recommendation for me, I can only think it's more dangerous for my fish.