Lava rocks are formed when volcanic lava cools. Over seven hundred types of lava rock exists, so lava rocks in stores may vary slightly in color shades. Lava rocks may be black or gray, but the most commonly sold lava rock is a cross between . These rocks are , as volcanic lava cools into a hard substance. Lava rocks are very in your tank. Usually, lava rocks come with a . Overall, lava rocks are appealing visually, tank healthy, and entertaining while you watch your fish swim through the rock's holes. A great lava rock is as follows:
Types of Fish Tank Rocks | The Aquarium Guide
Nice useful guide on rocks to put with your little fishes (or big fishes in some cases). I always liked putting those glass rocks almost like marbles on the bottom of the tank and have a large plastic rock in the middle. Theres lots of choices and its good that people know the dangerous rocks to put into the tank.
Safe And Unsafe Aquarium Rocks | My Aquarium Club
Choosing live rock for your aquarium is based on appearances as well as best value and cleanliness. When purchasing live rocks at your local fish stores follow the in order to choose the healthiest, most thriving rocks for your fish tank:
Rocks in Aquariums: A Fish Guide | PetHelpful
This means that if you have a tank running at pH 7 with any of the myriad fish that are happy at a near neutral pH such as tetras, corys, many South American cichlids, kribs, gouramis, rasboras, danios, etc etc. then carbonate rocks are not an automatic no-no, as is often suggested. In most cases, such rocks may cause the pH to drift up a few decimal points but it will normally remain within the acceptable range for such fish. You can easily check this by putting such rocks in your tank and testing the pH at weekly intervals. If you find it is moving up steadily and reaching undesirable levels for the species, just remove it. It will not have harmed your fish in the meantime.There are two basic types of rocky fish tanks, but generally you can add rocks to any aquarium. The two main styles include the Ishigumi style and the .