hi, i have a 29g tank, here is my setup:

6 x20wt tubes (sunglo/aquaglo/floro)
co2 pressurised 2 bubble per sec.
florite gravel
light time 12 h

ph 6.7 with co2 on during day time
ph 7.1 at night co2 off

4 dh(kh) API/HAGEN KIT
nitrate 10ppm (SEACHEM KIT)
PO4 0.4 (HAGEN KIT)
Fe 0.5 (hagen kit)
ca 20-25 ppm (hagen kit)

fert does:
.5 teaspoon kno3
.25 kso4
po4 3cc (made from dry fert)
trace 5cc
am doseing 3 times week with 40-50% water change

fish: one flying fox/one zebra lotch/4 zebra snails, no fish food used
my proplem:
1- plants not growing as fast like the first 3 weeks, some of the hygrophilia leaves turnning brown after the are 3 -4 days old, plant still growing but they are noe that green? amazon sowrd stoped growing?

2-there is some dark spots on few leaves ? alge please see pic

http://i210.photobucket.com/albums/b...Picture007.jpg

http://i210.photobucket.com/albums/b...Picture010.jpg

http://i210.photobucket.com/albums/b...Picture011.jpg

can some one guide me?

First, you have a lot of light, 120 watts for 29 gallons, obviously not CF bulbs and probably not with good reflectors, but still a lot of light. And, you keep the lights on for a long time every day - 12 hours, instead of 8 - 10 hours. So, you do need to be sure to provide adequate quantities of all of the nutrients, from CO2 to traces. Your nitrate dosage is twice what is usually used for a 29 gallon tank, but that won't cause any harm if you are also changing half of the water every week. (I'm ignoring your test results, since I doubt that you have calibrated the test kits, making the readings very questionable.) I can't tell how much phosphate you are dosing, but I found I needed almost 1/8 tsp of KH2PO4, three times a week, and with less light on my 29 gallon tank. I'm guessing you don't dose that much. Then, for CO2 you are supplying 2 bubbles per second, but don't say how you get it into the water, nor how much water circulation you have, so I don't know if that is enough or not. For the 29 gallon tank I had, I used probably twice that much CO2, but I was using CO2 mist most of that time. So, you need a drop checker, loaded with 4 dKH water to be sure you have enough CO2. At that light level having enough CO2 isn't optional.

My suggestions are, get a drop checker and use it, and make sure you are dosing close to 1/8 tsp of KH2PO4 three times a week. Also, be sure you have good water circulation in the tank, with a very slight surface ripple. Then reduce the lights on time to 10 hours - the extra time isn't helping the plants. But, having said all of that, you do have a very nice looking tank of plants, so you are very close to having things set up right.

thanks for you reply, let add more info, for light am using AH supply reflectors (3), am using dupla co2 checker , and co2 reactor 200 with a rio pump.
my kh2po4 dosing is 3 cc which will give about 0.75 ppm.
regarding calibrating the kits, i don't know how to do that, seachum nitrate kit comes with a solution to do that, the other dont , am not sure how to do that.
so, i think i will go to 10 h lights day.
should i use more po4?
thanks

one more thing, the co2 i hooked to a Milwaukee digital ph, which i check its calibration every 2 weeks. it hut the co2 at ph of 6.7.
another thing is the water temp which is at 29 c, am not sure how to bring it down.
thanks

The Dupla CO2 checker will work fine, but you need to load it with 4 dKH, distilled or DI water and pH reagent. That will give you a green color when you have about 30 ppm of CO2 in the tank water. Don't use the pH controller for anything except as a monitor of the tank pH, and that doesn't tell you anything important.

Your water temperature is about 2 - 3c higher than I run, so I don't think that is a big problem. I would increase the phosphate dosing to from 1 to 2 ppm per dose. (Just double what you now dose.) I have found that running the phosphate near the top of the recommended level does no harm that I can see, and it does prevent green spot algae from starting. Without phosphate the plants can't use the nitrate.

hi, am using plantex CSM+B, do you know if it has Mg in it? what are the sign of low Mg?
i adjusted my light to 10 hours a day, i doubled my po4 does
can the 120w light be casing the problem making some leaves turn brown?
please help

Try about 4 bulbs instead.
CMS has no Mg in it.
Use epsom salt at 1/4 teaspoon 2x a week.

Regards,
Tom Barr

i think there is some thing am doing wrong? plants are not growing any more ? they are not forming o2 on the leaves as they used to, am using EI, CO2 on target(green), just am notcing more brown ang green algae, what could i be missing after 7 weeks?

I don't see where you have said what filtration you use. A canister filter is probably the best way to go, since it provides both good filtration and good water circulation in the tank. If you have a hang on back type filter you may be dissipating the CO2 as fast as you are adding it, with the drop checker located so it sees the CO2 before it all leaves the tank. One quick thing you can do is locate the drop checker somewhere else in the tank to see if you still get a green reading.

am using eheim 2217 classic, i know its over kill for 29 g tank, i will change the location of co2 chekker and see.
thanks