11-14-2011, 11:47 AM
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In answer to your title question, probably yes. I had a look for data on the Penn-Plaxx but without success, but in my experience with many tubes, any one that "enhances fish colours" usually isn't sufficient for plants. These tubes are high in the red and blue spectrum, which is what plants need, but are very low in the intensity. Not sure why this is, but in every tube I have ever had this was the case.
Your existing fixtures are likely fine, so new tubes/bulbs is all that is needed. For the fluorescent tube, I would recommend a full spectrum or daylight type. From a fish store, the Hagen Life-Glo is my personal choice over single-tube tanks. ZooMed's Ultra Sun is nearly identical, and probably a bit less expensive. A very inexpensive alternative is a "daylight" tube made by GE, Phillips or Sylvania from a hardware-type store; these do not come in all lengths, so I can't say there is one to fit your fixture, but if there is, look for a T8 tube that has a kelvin rating of 6500K (6000K to 7000K range).
For the other tank, by "bulb" if you mean an incandescent (screw-in) type, then the best are the daylight compact fluorescent bulbs made by GE with a 6500K rating. Two 10w bulbs (assuming two sockets in the fixture) will work fine.