

These should be replaced every 6 months to retain efficacy. It’s not advisable to use these as a substrate in your tank and instead they should be used as a small addition to your tank. Since these rocks will release trace elements into your tank, they may harden the water and raise the pH level. These rocks are natural shades of white and grey and while they have beautiful surface texture, the edges are rounded to prevent injury to fish. By improving the health of the tank, these rocks will improve the odds of reproduction within your tank as well. They will also release other trace elements into your tank, improving the appearance and health of your fish and invertebrates. This package of rocks comes with a few varieties of rocks, including calcium rocks to improve mineral availability in your tank. These rocks come in a 60-gram package, which is just over 2 ounces. See or store associate for more details.The best rocks for freshwater aquariums for the money are the SunGrow Mineral Rocks because of their great price and benefit to tanks. Prices & selection may vary in stores & online. While delivery is contact-free, be sure to be home during your delivery window to bring any perishable items inside right away. Delivery may be delayed due to acts beyond our reasonable control, which may include, but are not limited to, weather, strikes, power outages, shutdowns, local, provincial or federal governmental actions, and other similar acts. Orders placed after 3pm will be fulfilled the next day. Order by 9am for delivery between 12pm-3pm, by 1pm for delivery between 3pm-6pm, & by 3pm for delivery between 6pm-8pm. Same-day delivery is available in most areas.

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