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ok i want to get my kids a 6.6 gallon tank it will be shrimp and moss. maybe grass.the 18 in t8 15 watt will it do for lighting? i will change the bulb to 6500 of course.
15 watts in a 6.6 gallon tank (assuming it's <12" tall) should be plenty to sustain most mosses and grasses. Just be diligent about monitoring your algae levels since medium to high light without CO2 can easily lead to algae outbreaks.