Help Guides

Water can look crystal clear yet still be deadly to fish and with reef tanks you have the complicated lives of corals and invertebrates and their needs to think about too.

Aquarium plants need lighting with the right spectrum if they are to be healthy and grow properly. Look inside to find out what works best.

Ammonia is really dangerous to fish, even when as low as one part per million, and its an invisible aquarium fish killer.

Struggling with green algae? This could be due to a number of reasons. Read our helpful guide on determining the cause of and combatting green algae.

Water changes are really important for fish tanks. They lower pollutant levels and can add buffers, freshening up the tank and aiding fish growth.

Marine fish have evolved to take advantage of all the different types of food that are available in the ocean, so their foods need to be diverse.

Most fishkeepers know about the importance of cleaning filter sponges, and to only ever do it in old aquarium water, not tapwater.

Fish stocking levels rely on several factors, but if your aquarium is more than 6 weeks old and has a mature filter, here are our recommendations.

Reef tanks take time to mature and within that time conditions may not necessarily be at their best for all inhabitants.