01-11-2007, 08:51 PM
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There are almost no lawn type plants that you will be able to grow under a single T-12 Fluorescent in a 15 gallon tank. If I am thinking about this right, you're talking about an 18 to 20 watt bulb. You need at least 3 watts per gallon of standard flourescent - 45 watts over a 15 gallon tank - to get a good lawn out of dwarf hairgrass or glossostigma or HC or microsword or pygmy chain sword, and you need that plus serious knowhow to do it with riccia. On top of that, if you are going to go over 2 watts per gallon, you will need CO2 of some sort unless you want to grow lots and lots of Back Brush Algae. In fact, unless you get pressurized CO2, you will get some of it.
Also, that bulb with the long thin leaves is probably a thai onion plant, which will eventually grow leaves long enough to cover the tank if not trimmed regularly.
That said, it is pissible to make a java moss lawn with either slate and hairnet, or needlework gridding weighted to the substrate with stones (or a combination of the two) Just lay a single layer of java moss, strand by strand either on a flat rock andkeep it in place with a hairnet (this is the method I use) or lay it out on a needlework grid, lay it moss side down on the gravel, and weight it with stones. The moss will grow through the holes in the gridwork over the course of a month or two.