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Considering this, how long does it take for moss balls to grow?
Your marimo friends will grow in tap water at room temperature as long as the water is changed every one or two weeks. The growth rate of Marimo is about 5 mm per year. they grow particularly large, up to 20–30 cm (8–12 inches).
In this regard, how do you revive a Marimo Moss Ball?
Clean your marimo enclosure with a brush if algae begins to grow on tank surface. If your marimo turn brown, make sure they're moved to a cooler location with less direct light. They may recover and turn green again on their own. If not, you may add a tiny amount of aquarium ocean salt.
Betta fish and moss balls can live in perfect harmony. Marimo moss balls can live in the same water parameters that bettas thrive in, however they do grow faster in colder temperatures. When they are fully saturated with aquarium water they will sink to the bottom and only move from being disturbed.