Haliclona is a genus of sponges in the family Demospongiae (horn siliceous sponges). It is extremely species rich and is divided into several groups. The most relevant species in aquaristic terms is Haliclona coerula, which is classified in the Soestella group, possessing zooxanthellae and thus keeping well in marine aquariums. They normally grow encrusting over substrate. One problem with sponges is that they can pollute the water heavily when they die. It is therefore best to remove sick sponges from the aquarium early. They require a rather high water quality and good flow.

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