Newbie with his 700 litre tank

Off the top of my head, Marsilea Hirsuta is a good choice.

About the dosing regime, I think you can go with 2x weekly for a low light setup. On the recommend amount in teaspoon measurement, I leave it to the pros here, who I am confident will chime in to assist.

Guys ?

 

Sounds reasonable, you'll be dosing about 7.5ppm KNO3/wk, so the max you should ever see is 15ppm b4 50% WC; that assumes 0 uptake, (and 0 input from food/waste) so you should be fine there. PO4 dosages look good to me too. Depending on fish load and plant types you may even be able to go lighter, although the extra shouldn't hurt. I'm also no expert but just crunching numbers looks good to me.....

 

If you add a pressurized CO2 system everything about this tank will work better. I'm not sure you will have a low light intensity with those lights, and while the average intensity may be relatively low, directly under the lights could be pretty high. With a good level of CO2 in the water you can grow several different carpet type plants, but without it you may have trouble growing any of them except perhaps Marsilea minuta.

You have already spent more for your substrate than a good CO2 system would cost, and the benefits of the CO2 will be at least as great as that of the ADA soil.

 

You need to work to get good CO2 distribution all over the tank, with a concentration approaching 30 ppm or higher. Then, by fertilizing so none of the nutrients is limiting, you should be able to grow plants healthy enough and growing fast enough to prevent algae from ever getting started.

I'm not sure that your dosing is high enough, but without knowing what light intensity you will get from those lights I don't know for sure. Can you borrow a PAR meter from someone? Is there an aquatic plant group near you where you could join and be able to borrow one?

 

I'm not sure of the answer to that question. My tank has relatively low light, but good CO2 concentration, and has only slow growing plants. I use, as best I recall, about half of the EI dosages in the charts. I don't recall because I dose daily, 1/7 of the total weeks dose every day, and I calculated what that was, and have it written on my fertilizer bottles - X tsp of KNO3, Y tsp of KH2PO4 in 16 ounces of water, to be dosed one ounce per day, etc. I have to work backwards to find out how I arrived at those numbers. In any case, it seems to work well.

 

I am into that too. Apart from Java Ferns, Bolbitis, what other STEM plants that grow slow? I would prefer the more exotic type.

Yes, I think that is the best way to go, dose daily. Thanks Hoppy.

 

I have a couple of cuttings of Ludwigia repens and one of Sunset Hygro in my tank, just to see how they will grow there. The Ludwigia is doing fine, and growing slow, but the Hygro is growing faster, with a thinner stem, growing horizontal to get nearer the center of the tank. I will be removing that cutting shortly. And, I suspect I will remove the Ludwigia later. But, I'm now convinced that Ludwigia repens is a good low light plant.

 

Just curios. When a tank is plagued by some sort of algae, do we
1) shorten photo period and skip dosing fertilizer (probably a week or two) OR

2) maintain length of photo period and cut the fertilizer by half?