They clean my plants, rocks, wood and windows, but I dont ever see them on the sand other then briefly lying on it. Do yours clean your sand too? And if so, how did you train themI was going to suggest Oto's - they do require specific care, but they can clean a tank of diatoms in matter of days.
They are doing well because they are eating the algae? If you really want to reduce their number, a slice of cucumber should collect quite few.In the tank where I have had a Ramshorn Snail problem, there are also no fish or any other livestock.
Maybe I need a bag of silicatex or similar in the filter for a while
They clean my plants, rocks, wood and windows, but I dont ever see them on the sand other then briefly lying on it. Do yours clean your sand too? And if so, how did you train them
Once the silica concentration declines, other types of phytoplankton that do not need silicon typically replace diatoms as the predominant form of planktonic algae".
That is my understanding, because they are almost universal anywhere there is liquid water including damp moss, wet soil etc. you can tell that silicon limitation isn't really an issue for them.you will never be able to get the levels of silicates low enough to affect the diatoms - they can flourish on microscopic amounts.
They have the same requirement for nutrient as all the other photosynthetic organisms, but with the addition of silica (Si).But, that being the case, what then causes growth of diatoms?
I don't think any-one is saying that diatoms don't require silicon (Si), but I'm not sure that you can say that there is a correlation between silicon concentration and diatom growth in our tanks, particularly if you have higher plants (this is an aquaculture paper where the only plants are phytoplankton). Later on in the same publication it says:I thought I should re-visit this and found the following:
From the above link, I have extracted this:The silicon plants take up in silicic acid from water strengthens cell walls. Among the phytoplankton, diatoms particularly need silicon.www.aquaculturealliance.org
"Studies of temperate-zone lakes have shown that diatoms often bloom in the spring, but this phenomenon leads to reduced silica concentration. Once the silica concentration declines, other types of phytoplankton that do not need silicon typically replace diatoms as the predominant form of planktonic algae".
I always have snails in my tanks and I very rarely have any apparent diatoms (there will be diatoms present, because diatoms are pretty much universal in liquid water)............ and it is not known how low the silica concentration must fall before diatom growth is negatively affected..........It would be desirable to know the relationship between silica concentration and diatom growth, but this topic has not been investigated in aquaculture ponds. Lack of information about the relationships between silicate fertilization rates and silica concentrations in water, and how fast silica disappears from water also complicates efforts to encourage diatom growth..........
Hi @GHNelsonThey lay eggs....but don't see young snails!
Hi @dw1305I don't think any-one is saying that diatoms don't require silicon (Si),
Hi @John qJust to throw a another spanner in the works and may be totally unrelated but if I reduce my light intensity I tend to get diatoms, if I increase it the diatoms disappear and gets replaced by algae. Trying to find that sweet spot in the middle is proving rather elusive atm.
I have very high TDS out the tap 355!
Yes, perhaps you misunderstood. As Darrel mentions, algae consume all the same types nutrients that are present but there is no correlation between the nutrient level present and the rise of the algae. Just because silicates are present this does not automatically mean that a diatomic algal bloom is present. Algae require PO4 but PO4 does not trigger algal blooms. Similarly BGA require Nitrogen, but we can cure a BGA bloom by increasing the concentration level of NO3 in the tank.Hi @dw1305
Only @ceg4048 can give a definitive answer to this, I guess. Because it was his statement below that I was addressing. Have I misunderstood what he was saying here?
"neither sand nor silicates in the water column have anything to do with diatomic algae"
If it's me that's got the wrong end of the stick, then fair enough. But, as sand/silicates are SiO2 and particularly if an aquarist is using tap water, then surely diatoms will utilize the silicic acid? In which case, sand/silicates in the water column will have a bearing on the growth of diatoms.
I understand what you are saying, but I still think we are in "apples and pears" territory.But, as sand/silicates are SiO2 and particularly if an aquarist is using tap water, then surely diatoms will utilize the silicic acid? In which case, sand/silicates in the water column will have a bearing on the growth of diatoms.
...... Moler and diatomite consists of fossilised remains of a special type of hard-shelled algae, which gives the material its unique organic structure. Diatomite in general is over 30 million years old – the Danish Moler was formed more than 50 million years ago .....
Algae require PO4 but PO4 does not trigger algal blooms. Similarly BGA require Nitrogen, but we can cure a BGA bloom by increasing the concentration level of NO3 in the tank.
It will definitely support the growth of diatoms, encourage is more open to question. My guess would be that it doesn't, purely because of the efficiency of diatoms in extracting silicon from any water source, so "some" is always going to be "enough".Silicic acid in tap water may encourage and support the growth of diatoms.
My guess is that in heavily planted tanks you don't really get obvious diatom blooms, certainly not after the initial start up phase.neither silicon nor silicates nor diatoms get a mention in the index of Diana Walstad's book, Ecology of the Planted Aquarium. Nor The 2Hr Aquarist.
Thanks for that, that looks an interesting paper.But, take a look at the following: