Features of Kouroka Lava

Why is Kouroka Lava good for your tank?

Kouroka Lava are the volcanic rocks in Japan. They are dark yet shiny, angular yet light and super porous, very suitable for aquascaping and filtration.


Being angular, Kouroka Lava makes Iwagumi-style (rock-formation-style) aquascaping simple. The angular edge of the lava rocks is a striking feature to evoke a glistening mountainscape in an aquarium. Having the lava rocks locked into each other firmly, the layout is almost unbreakable.


In Iwagumi-style aquascaping, water plants are something that cannot be missed to represent the green areas of a landscape. Kouroka Lava has an uneven surface, where mosses and other water plants can spread over steadily. A natural view without extraordinary tools to keep the water plants in position can be created easily.


Rocks are usually acidic or alkaline. When they enter an aquarium, they may change the PH level of the water inside, ended up being not suitable for the inhabitants. Kouroka Lava have a neutral PH level, so the water quality will not be altered. It is safe to put Kouroka Lava into an aquarium.


Unlike other rocks, Kouroka Lava leaches its energetic nutrients of the earth into the aquarium water little-by-little for a long period of time. The inhabitants will not feel discomfort due to a sudden increment of nutrients. They just do not realise. Kouroka Lava is good for raising water plants, shrimps (for shell formation) and fish.


Due to the high porosity, Kouroka Lava provides more than adequate homes for beneficial bacteria to attach and to reproduce themselves. It is not only a beautiful aquascaping material, but a perfect choice for filtration too.


All packages include a combination of colours for our black lava rocks. Bluish black lava rocks are shiny, just like sapphires in dark light. Reddish black ones are full of energy, just like active volcanoes. Sometimes, part of the surface is yellow, showing the elegance of nature. The expression is just colorful.


The weight of Kouroka Lava is less than half of that of the conventional ones, so it can be used handily.