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wannalearn 01-23-2012 01:01 PM

redoing planted 75 gal/lighting question
after limited success with my planted 75 gal... have tore it all apart, and it is cycling as we speak, i realize a little more research is needed, and less impulse buying... so my question is, is 2 t5 bulbs both 65k over a 75 considered moderate lighting, i have heard byron say that the watt per gallon rule done really work anymore, with both bulbs burning it looks rather bright, i am wanting to run probibly frogbit, will my current lighting burn up the frog bit, and also wondering with a covering of frogbit, and possibly watersprite, what level of light would rearch substrate plants... thanks in advance..

Jayy 01-23-2012 06:18 PM

I had the same problem with my 55gal. I was told shops, that can be found at hardware stores are the way to go. I was also told that with the t5s co2 and fertizer would have to be added. The fertizer daily. Soo it's really up to you, do you want all that extra work or modrate lighting for half the price. Glass tops are needed although for the lighting to work its best. Here's my thread:

wannalearn 01-23-2012 06:40 PM

i already have the dual t5 lights, and the way the fixture mounts, you caint run a glass top.. has to be open... which i prefer anyway..

Quantum 01-23-2012 06:55 PM

If this is High Output T5 it would be high light, though there is no set number of watts that define low, moderate, or high. Floating plants are recommended so as to limiit the amount of light entering the tank. Even with a layer of floating plants, you should still be able to grow swords, crypts, anubias, etc. I've never tried it myself, but Salvinia may be a good choice since it apparently does better with some air circulation and bright light.

Byron 01-23-2012 08:22 PM

With T5 HO you will have high light with two 48-inch tubes over a 75g. I have two T8 tubes over my 75g and still battle algae. You have the rough equivalent of three T8 tubes.

You will have to limit the duration, and have a good cover of floating plants.

wannalearn 01-23-2012 11:18 PM

quantum, i thought all t5 bulbs were HO, didnt know there was a diffrence.. and byron i figured probibly a 8hr time on the light, and a pretty much complete covering of floating plants, either frogbit, or watersprite, maybe both if the frogbit wouldnt choke out the watersprite..
byron, i also thought about just running one bulb, and keeping the second one off, just kind of a spare.

Quantum 01-23-2012 11:30 PM

most are HO, which are 54 watts for 48" bulbs, normal T5s (which produce about the same amount of light as T8s) are 28 watts for 48"

you could get by with one T5 HO bulb, but some dual tube fixtures will only work with both bulbs lit

1077 01-24-2012 04:13 AM

Can raise the T5 fixture above the surface of water if lighting proves too much which I think it will.
Some foks use shelf brackets attached to wall to support fixtures or,, PVC or conduit attached to the wood stand on each end to support the fixture.
Trouble is finding the right height to allow enough light without providing too much.
I use cheap (comparably), Aqueon Triple tube fixture with three 32 watt bulbs over 80 gal tank and it so far seems about right.
Fixture sits directly on the tank glass tops or no glass.
I tried with no glass which I like,,but too many fishes found carpet surfing.:|

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