Growing Beautiful Aquatic Mosses

Aquatic mosses can be some of the most beautiful aquatic plants if grown correctly and given the right environment. Wispy fronds of all shapes and configurations can add texture and detail to any aquascape. However, one unique aspect of most aquatic mosses is that their appearance is highly dependent on their environment. This can make the difference between a lush, full wall of Christmas moss and a stringy tangled mess. Here are some tips to get the most out of your aquatic moss, whether it be simple Java Moss or Peacock Moss:

- Mosses love light. Although they will survive in minimal light (especially the ever hardy Java Moss) they will grow scraggly and stringy and grow very slowly. The more light you give your moss, the faster and fuller it will grow.

- Mosses grow best attached to something. This is their epiphytic nature. They can attach to almost anything using strong anchor fibers, but the best options are rocks or driftwood. Simply tie the moss down onto an object and within a week or two it will be safe to remove the string. If you let your moss drift around, it will grow stringy and be much less attractive.

- Mosses grow much better with CO2. Although not needed, growth is dramatically affected by CO2. When I first added CO2, my Christmas moss took off and grew very rapidly. Combined with higher light and being attached to something, it also makes the moss more dense and healthy looking.

- Avoid moss eating fish and bugs. Siamese algae eaters top out the list here as the worst offenders, but there are also reports of small bug-like animals that can also devour whole stands of moss in days. If you see stripped fronds or notice your moss looking more stringy than usual and you have an offender in your tank, you are best off moving them or trying to feed them enough so they don't take to snacking on your moss.

- Periodically clean out your moss. Moss works as an excellent filter, trapping all sorts of debris. The trouble is, this also encourages nasty types of algae to grow, including Blue Green Algae. When you change your water, run your fingers through the moss and shake out any loose debris, making sure to remove as much of it as possible from the tank.

- Avoid algae at all costs. It is next to impossible to clean any type of algae out of moss. Often, if your moss becomes infested with algae, you'll have to rip it out the affected areas completely. The fronds are just too small and delicate. Instead, maintain adequate CO2 levels and fertilize regularly to fend off algae.

- Mosses love being trimmed. As much as a pain in the butt it can be to try to trim moss and clean up all the cuttings, it will grow back thicker and fuller. There really is no strategy, just trim it back with scissors and try desperately to catch all the small pieces (otherwise you'll have moss sprouting up all over your tank!)

Vesicularia montagnei "Christmas Moss"

Common Name: Christmas Moss, Xmas Moss
Scientific Name: Vesicularia montagnei
Geographic Location: Unknown
Temperature: 65F-77F
pH: 5.0-7.5
Light: Low (1.5WPG) to High (3WPG+)
Growth: Slow
Difficulty: Beginner

Christmas Moss is as mysterious as some of the other mosses in the aquarium hobby. There is no consensus on its geographic origins and even the scientific name has a tendency to change. Its growth habits and appearance are just as varied. When grown attached to a piece of driftwood or rock, it forms triangular fronds in the shape of Christmas trees (hence the common name). If allowed to grow free floating, it tends to have a much less organized appearance and the triangular fronds are much less pronounced. In this form, it is often confused for the much more common Java Moss. In lower light, it grows much less densely, and again, is often much less organized in structure. Only under higher light conditions, attached or anchored to an object, does Christmas Moss show its true structure. It will form a pillowy bush of triangular fronds that is very attractive and undemanding.

This moss is very easy to grow in the aquarium, as it will grow with almost any amount of light. Although not as hardy as the legendary Java Moss, it will survive with low light and no CO2. Growth will not be the ideal structure and will be considerably slower, but it will still live. Like other mosses, Christmas Moss prefers cooler temperatures, under 77F. Over this, it tends to suffer, growing more slowly.

As an aquascaping element, its uses are limited to covering hardscape (rocks, driftwood) or creating a moss wall. A moss wall is created by sandwiching the moss between two pieces of mesh and placing this in the back or sides of a tank. The moss eventually grows through the mesh and covers it up, creating a wall of attractive triangular fronds (as seen in the picture above). It can be used as a carpeting plant, however this is not recommended, as it easily gets choked with mulm and debris and becomes an algae magnet.

Christmas Moss is best bought from other hobbyists who have it growing under ideal conditions in their own aquariums (thus making identification easier). Getting it in a local pet store or online can be risky, as Java Moss can be passed off as Christmas Moss at less than reputable establishments. Christmas Moss can be identified by its more regular branching pattern and slightly different leaf shape. In the picture below, the moss on the left is Java Moss and on the right is Christmas Moss.



Shrimp and fish fry use it as cover and it is also an excellent source of food for both, harboring tiny infusoria (bugs). Overall, Christmas Moss is an excellent plant for covering hardscape, filling in gaps, and creating living backdrops in any aquarium.