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Dry Ferts, Dosing, Plant Growth & Stunned Algae Growth

4576 Views 30 Replies 10 Participants Last post by  plantbrain
Info:
DIY LED light (Light PAR is good i'd say. 6500k w/ whites, red, and blue. on for four hours twice a day with time between to cool down.)
40 gallon medium planted
dosing 3-5mL/day of macro micro mix i bought. (My dry ferts came pre mixed with KNO3, K2SO4, MgSO4 and CSM+B all proportionally together.)
High tech CO2 (1-1.5 bubbles per second)
Do 35-50% water changes every week and a half or two weeks.

Water Parameters:
pH: 7.2
Nitrates: about 80-100 ppm
Phosphates: between 0-0.25 ppm
KH & GH: Both read about 200 ppm (11 drops with the API test kits)

I'm getting what seems to be lots of pearling so i thought i'd ask,
If i stop dosing ferts, will the pearling stop when the ferts run out or will pearling keep going as long as there is light and co2 with dense o2 saturation?

only reason i ask is i want to starve out algae (or stun it's growth substantially). Some i have seen in my tank before cleaning recently are in links below
This kind on the glass:
http://i68.photobucket.com/albums/i2...potalgae-2.jpg
That wasn't the only kind on glass. There was other kind that just made the glass less transparent. Almost as if it had to do with calcium because it was hard to take off. I still see streaks where it stayed on from scraping the glass with razor. (GH supports this as hard water?)

and this kind on my rock:
http://www.loaches.com/articles/imag.../image_preview
It is pretty short and fussy and not like hair grass. Doesn't look that color green either. has few brown spots.

Basically i want to know if i'm dosing too much ferts? (Sometimes 3mL/day sometimes 5mL/day) Is there any way i can know which type KNO3, K2SO4, or MgSO4 i need more or less of in the tank? Any suggestions would be helpful.
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You need to be dosing phosphates too. Plants have to have phosphate in order to grow and use the other nutrients you are dosing. Phosphates don't cause algae in aquariums. And, you can't stunt algae growth by limiting any fertilizing. Algae require minute amounts of nutrients, so there are always plenty of them in the water for the algae.

Green spot algae, GSA, can usually be eliminated by just dosing more phosphates. I dose about twice the recommended amounts for that reason, and GSA isn't a problem for me.
 

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That's about all. You might need mag sulphate if you hardness is mostly calcium. But most recommend Epsom salts for that from the drug store.

Are you sure that dry mix of yours doesn't have phosphates as well? Seems odd they'd leave it out...
You can't mix phosphates and iron in the same package. They combine to form an insoluble precipitate, making the iron only very slowly available to the plants. That's why that PMDD mix never contains phosphates.
 

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I see you are in Sacramento, or in the area. If you are on the city water supply you have soft water, but the county water can be pretty hard, especially in the summer when it is mostly well water.
 

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When I lived in the county of Sacramento, the Arden-Arcade district, not the city, much of the water supply came from wells, scattered over that water district. My water then was much harder than it is now. I hate Seachem Equilibrium, so I quit using it. I think I need to buy a different GH bulder and see if that makes a difference in my low light tank.
 
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