Sedimentary rocks consist of limestone breccia marl conglomerate sandstone and shale.
Marble aquarium rocks.
For local water that is low in hardness and alkalinity using some calcareous rocks in the aquarium will raise the hardness and alkalinity and stabilize the ph.
The ideal aquarium to have for using large rocks is a flat bottom acrylic tank but glass aquariums can also be used.
These are often best used in saltwater aquariums where they look more natural.
Meanwhile metamorphic rocks include dolomite schist marble quartzite gneiss phyllite slate and hornfels.
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Avoid geodes shells marble limestone dolomite and crushed coral in tanks.
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Both substrates have pros and cons.
Use lava rocks to give small fish places to hide or just to give yur aquarium some atmoshpere.
Calcareous rocks limestone marble and dolomite have a high calcium content and are usually not safe for use in a freshwater aquarium.
A similar case is present for coral and shells which are made mainly of calcium carbonate.
Gravel has been a staple aquarium substrate for years but many hobbyist are starting to use glass marbles.
Depending on how you plan on setting up your aquarium which substrate you choose may determine how you maintain your aquarium.
If it fizzes its unsafe and shouldn t be used.
Limestone is probably the most frequently encountered calcareous rock followed closely by marble.
Stay away from calcareous rocks because these contain calcium that might boost the hardness level and ph level in the water.
A good way to test for safe rocks it to drop a couple of drops of ph down on the rock in question.
Inert rocks are the best types of freshwater aquarium rocks.
Gravel and marble are two popular choices.
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