Coral reef update

It's coming up to two years since we set up our marine tank: it seems to have settled down into a balanced, sealed ecosystem, which is what you're trying to achieve. It looks particularly beautiful under actinic light, when lots of the polyps glow green or blue.

Obviously, regular water changes (at least once a week) filter cleaning and parameter tests are essential, but virtually everything in the tank seems to have 'bedded in' and, in most cases has spread or reproduced. This is usually a sign that, for them at least, conditions are nominal. The large green disc (with a Cleaner Shrimp perched on it!) has divided into two individuals, while most of the soft corals have populated new rocks. The one real shame is that, because of CITES regulations, we can't even give away the new individuals...