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mistergreen 03-29-2020 05:43 PM

Re: Algae and Iron
 
Besides, limiting your aquarium lights to a certain spectrum to avoid algae wouldn't look aesthetically good.

Yorkie 04-05-2020 11:59 AM

Re: Algae and Iron
 
1 Attachment(s)
Quote:

Originally Posted by hoppycalif (Post 1004699)
Yes, I have seen those charts, but I haven't seen any data that would support a belief that certain wavelengths of light cause algae problems. That, too, is a very hard experiment to try.

Hi Hoppy,

Perhaps I've confused things by referring to the chlorophyll a and b peaks. I wasn't suggesting that specific wavelengths could promote growth of algae. Diana Walstad has drawn that to our attention by introducing us to iron photoreduction at less than 520nm.

Now, I do want to suggest that certain wavelengths may indeed promote algae (and BGA). Please see the attached absorption spectra. The two accessory pigments, phycoerythrin and phycocyanin are to be found in BBA and BGA, respectively. So, light in the band from 500nm to 620nm may have the potential to promote both BBA and BGA. And, higher plants only require a small proportion of light in this band. I may have suggested elsewhere on this forum that reducing the intensity of light in this mid-band when the tank is not 'on display' may help to reduce BBA and BGA. Then, when the tank is 'on display' for the benefit of we humans, the spectrum would switch to one that is aesthetically pleasing.

Yorkie

hoppycalif 04-05-2020 06:19 PM

Re: Algae and Iron
 
There is certainly some information that might indicate that the spectrum of the light we use could affect how much algae we have. But, we would need to experiment to determine if it really does that, and that would be difficult to do. Changing the spectrum, while maintaining the same light intensity isn't an easy thing to do.

crinum1111 04-24-2020 09:37 PM

Re: Algae and Iron
 
Hi,
Recently read the Walstad book I found it helpful too and this was a key point of interest for me as well. My interpretation after a few readings was to deliver iron to the roots .With some caution though as iron toxicity in low ph substrate is of potential concern . Don't know if even high cec rated substrates take up the iron aggressively enough . I might try dosing moderately with full spectrum ferts ,plus bit of extra npk ( i'm running no fish currently ), a bit of trace and flourish tabs on fast growing iron hungry plants .If I get a good crop of fast growing iron hungry plants going probably switch back to just full spectrum fertilizer then .

hoppycalif 04-25-2020 03:54 PM

Re: Algae and Iron
 
My experiment isn't going to be a success. I suspect I don't have enough substrate in it, and the plants are not doing very well as a result. But, if I can't get both sides of the tank to start out doing well it isn't possible to see the effect of changing something on just one side. When I think about this some more I will probably start over again, but I need to keep the two betta's living while I do it. I'm still intrigued by what I read in Diana's book about iron.

Yorkie 05-01-2020 12:29 AM

Re: Algae and Iron
 
Quote:

Originally Posted by hoppycalif (Post 1005233)
My experiment isn't going to be a success. I suspect I don't have enough substrate in it, and the plants are not doing very well as a result. But, if I can't get both sides of the tank to start out doing well it isn't possible to see the effect of changing something on just one side. When I think about this some more I will probably start over again, but I need to keep the two betta's living while I do it. I'm still intrigued by what I read in Diana's book about iron.

Hi hoppycalif,

It's a shame that the plants are not growing well and that your experiment will not be a success. I will follow this with interest should you decide to try again.

Yorkie

hoppycalif 05-01-2020 01:42 PM

Re: Algae and Iron
 
I have torn down the tank(s), and have replaced the substrate so it is almost a full 2 inches total thickness, with "dirt" (Black Gold from Ace Hardware) making up the bottom 3/4-1 inch. The top is Safe T Sorb. I should have more plants arriving on Monday, and I salvaged several from those still living. I plan to not use the little in-tank filters again, since the Bettas don't really like them.
By next Wednesday or so I should have it back to life. Meanwhile the two Bettas are in big cylindrical vases, in about a pint of water. My fingers are crossed!

hoppycalif 05-13-2020 10:30 AM

Re: Algae and Iron
 
1 Attachment(s)
I have my double 5 gallon tank set up again, almost. I will add some more crypts as soon as I get them, probably in 2 days. The substrate is much better now, but I am still poking it every couple of days and getting lots of bubbles. So far, no bad smell, so the bubbles aren't that bad. Now, I will see if I can treat both halves the same and get two equally good/bad tanks.


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