03-24-2010, 04:00 PM
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Plants can grow just fine in gravel. Java moss doesn't have any roots from what I know, though. It attaches itself to whatever it is growing on. In my experience, the java moss attaches slowly, though. Anyways, if you're talking about laying the java moss in the gravel, it might be a good idea to just use your finger and stir up the debris that is caught inside a little. It might be better to attach it to a piece of drift wood, rocks, or decor. (:
But ya, since java moss is different than most plants, you'll probably be able to just move it when you're gravel vacuuming because the little gravel that it attaches to will be enough to weigh it down when you move it back. :)
Now, for other plants, if they are plants with a lot of roots, its not good to gravel vacuum too close. You'll suck the nutrients out of the soil and disturb their roots. Which can stop them from growing for a while if you disturb them too much.
Other things you'll want for live plants: a bulb rated at 6500 K (fullspectrum), possibly an internal or canister filter (though I think some plants will do just ok with a HOB filter, but if you want your plants to do well you might want something that does not cause surface agitation because the CO2 will leave the water, which the plants need for optimal growth. Goodluck! :)