Planted Tank VIP
Join Date: Jul 2002
Location: Winston-Salem, NC
You want to keep them about 10"-12" above the water level and shield them with glass to prevent splashes.
Lighting photoperiod is subject to your nutrient levels and mostly based on algae growth. Start with 8-10 hours and step it up until you see significant algae growth and then back off. Plants do well with photoperiods of up to 12-14 hours, but not much more.
With that much light, you are going to need pressurized CO2 injection. If you don't have a pressurized CO2 system set up, there will be more light than the plants can use with the given CO2 levels and algae will proliferate. Get a regulator from a beer keg supplier for $40, then lease a CO2 tank from a welding supply store ($30-$40 a year) and plumb the co2 into a reactor, powerhead, etc.
Any particular reason you're going with the Mercury Vapor lamps? The color output is usually in the 3000K range (very yellow). With as much output as they will provide, the color isn't a problem for the plants - they'll still get all the light they need in the limited blue and red output the Merc lamp will provide, but algae will do better than the plants with the yellow light.
- Sam P -
plantedtanker in limbo - all tanks currently in storage