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Noticed hole about 2 weeks ago. Local fish store (Canada) told me to isolate and use Melafix and aquarium salt. I have done that along with frequent water changes but the hole
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Amazon.com : API GH & KH TEST KIT Freshwater Aquarium Water Test Kit, 2.5 oz. : Aquarium Test Kits : Pet Supplies
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API Liquid Aquarium Fish Tank Test Kit PH KH GH NO2 NO3 NH4 CA PO4 MASTER KIT | eBay
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