The number and spacing of LEDs for any size tank can be calculated with reasonable accuracy using a Excel Spreadsheet "calculator" shown here: http://www.plantedtank.net/forums/di...ml#post1803323 I doubt that you will want to use Cree XP-G LEDs for that small a tank. Perhaps XR-E would be a better choice.
I understand you are the aquarium lighting mentor. I was sent over here from Nano Reef by Evilc66. I am looking for some help with the lighting for my Aquarium.
I am new to the aquarium/lighting arena. I have a Fluval 12 gallon tank with fresh water. I am wanting to grow some high light plants and carpet plants.
I am considering a DIY modification to the lighting. I am looking into getting the CREE XP-G LED's. What do you think is the appropriate amount of cool white led's and the total amount of watts/lumens for the 12 gallon?
Surprisingly everything has been fine. I am running pressurized CO2 in the 29g now, and the plants are growing crazy. The issue is I am starting to see some GSA. I have had these lights on the tank for two months now. I'll try putting a layer of window screen on and see if that helps the algae issue. The lights are on right now for 8.5 hrs a day.
Two T5HO bulbs close together, with a good reflector, should give you high light at the substrate (24 inches away, assuming 3 inches of substrate.) That is too much light for what you are trying to do. A layer of figerglass window screen would reduce that to medium light, which may still be a bit more light than you need. Two layers reduce it to low light, just about right. I'm assuming the lights are both T5HO, and that they overlap in the middle, by two feet. That two feet of overlap is even higher light.
I suggest you try for only low light, not use CO2, and if you are concerned about keeping enough oxygen in the water, direct filter returns up towards the water surface to create surface rippling across the whole length of the tank.
Hi Hoppy ,
This is Ann7667 and I need your advice on lighting.
Tank: 72"x23"x18" (23" high)
Substrate: pool sand
Fish: 7 Rio Tapajo Red Noses (geophagus) (2 are 4" and 5 are 7"), 6 4" clown loaches, 5 Cory dora juliis, 1 5" Ancistrus, 1 Juru Pari 7"
Plants: low light 4 feet along the back half.
Lights: 2 4-foot lights one has two Coralife T5 HO 54 that sits 4" over the glass; one With 2 Sylvania HG 28 & sits on the glass.
1. lights sitting on the glass cause BBA so i will hang them instead. How high? Will my fish jump out?
2. How much lighting do I need?
3. With more light, do I need CO2?
4. It is so important to me that my fishies are comfortable and have enough oxygen in that tank. What is the balance of light needed to grow low to medium light plants and Co2 needed to prevent BBA growth and leaving enough oxygen in my tank for my fishies to be comfortable.
A 2 bulb Hagen GLO light sitting on top of a standard 29 gallon tank would be very high light. That is very likely to be too much light to ever get enough CO2 in the water to keep the plants growing well, if you have fish in the tank.
I was wondering if you could tell me if I have too much light in my tank?
I currently have a 29g tank with a Hagen T5HO GLO Double bulb fixture. Standard reflectors that came with the fixture, and both bulbs are 24W 6700k.
Assuming this is a 4 foot long tank, the 2 foot T5HO light would give sufficient light on the portion of the substrate that is under the light, the middle 2-2.5 feet of the tank, with the ends being very low light. A four foot T5HO would give about the same light intensity, but over the whole length of the tank.