Soil Cap: Gravel, Sand, or none? | Aquatic Plant Forum
4. The problem of uncarefull start specific to fine sand (especially - white) - algae and cyanobacteria. They can easy grow on it. Sometimes it's enough to ceep some shrimps and dwarf catfish for solution. It doesn't matter eat them algae or not - "bothering" sand they prevent colony grow. 5. The fine sand prevent dirt to sink in substrate.
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