green layer on the water
Posted 22 June 2010 - 10:10 AM
In my aldrovanda water i have a problem with a green layer on the water that appears every day in the evening. I try to remove the layer every few days with a paper (i can skim it off the water), but it keeps on returning.
I noticed that the green layer appears faster and more profound when the sun was shining bright that day.
I have a 2 cm of peat on the botom of the tank, int he water there is a waterhyacinth, Ceratophyllum demersum and an eliocharis acicularis.
I tried to add daphnia in the water, but the majority of the daphnia die within 3 days. The walls of the tank are clean with no algae to be seen.
I have also seen a lot of worm-like creatures in the water. They are around 7 mm long, and crawl over the botom or wall of the tank, so i dont think they are mosquito larvae.
the aldrovanda dont seem to be harmed.
I will try to take a picture of the worm thingies, but i dont have much hope that a picture will turn of very good with my camera.
Anyone knows what that green layer is, and more importantly: how to get rid off it? So far the only way to completely remove it is adding so much water to the tank that water with the green layer just spill out of the tank. the downside is that the layer reappears 2 days later again.
Posted 22 June 2010 - 10:30 AM
anyone knows what it is?
Edited by Tha_Reaper, 22 June 2010 - 10:31 AM.
Posted 22 June 2010 - 10:44 AM
If the setup is relatively new and there wasn't the problem initially, then its probably the same issue I had: algae, caused by too much nutrients in the water. Using paper or otherwise removing it is fighting a losing battle. If you can, transfer the Aldrovanda to another setup and let this one alone till the plants and algae burn off the excess nutrients in the water. When that happens, the algae will all die off or at least die down to a level where you don't really notice it. You shouldn't leave the Aldrovanda inside if you choose to do this because initially the green layer will get thicker if not consistently removed and when it is thick enough, it will start to affect the Aldrovanda.
If the setup is over a year old and the problem only just came up, then you might want to look for a source of nutrients going into the water. It could be the worm thingies...though this seems unlikely unless you've got a major infestation. The worm thingies look like some kind of insect larvae, but I could be wrong.
Edited by ifurita, 22 June 2010 - 10:46 AM.
Posted 22 June 2010 - 10:56 AM
Having to find another container is kind of a blow for my plans, since i dont have much room left for another tank, and not the time to make peat sink sufficiently in another tank before i have to go on a weeks vacation.
because of this green layer i have already refreshed the water once. i totally emptied the tank, and refilled it with fresh water. that kept the layer at bay for 2 weeks, so if there are excess nutrients in the water, i think they "leak" into the water from the peat.
Edited by Tha_Reaper, 22 June 2010 - 11:01 AM.
Posted 22 June 2010 - 11:21 AM
Posted 22 June 2010 - 11:29 AM
@ifurita: is it better to place the tank in full sun to promote growth and depletion of nutrients, or should i keep it in the half shade like its now? it now catches full sun from dawn till 13.00, and shade the rest of the day.
Posted 22 June 2010 - 12:56 PM
Posted 22 June 2010 - 13:03 PM
i thought it could be dragonfly larvae, since they fly a lot around the tank, and they sometimes seem to lay eggs in the surfacing water plants, but after looking at wikipedia how the larvae look, i think that must be wrong.
Posted 22 June 2010 - 13:34 PM
Use local pond water, and put in some clay, and silt from a local pond with large monocots, like Phragmites, Typha, Juncus, Carex, etc., along with the leaf litter of these plants, and have only enough water to cover the Aldrovanda. Then get some aquatic/marginal plants from your local home and garden supply stores, such as ornamental grasses, and plant them in the silt and spread out the roots, and lay the Aldrovanda directly above those roots, even comingled. There is a fully mutual symbiotic relationship where those monocot plants soak up and assimilate the nitrogenous matter released from the Aldrovanda, and in exchange, release a constant supply of CO2 which is absolutely essential for the Aldrovanda to thrive. There should be loads of different organisms with the Aldrovanda, from snails, mosquito larvae, copepods, rotifers, worms, fresh water shrimp, etc. I have no idea what those worm-like things are in your tank. Don't worry about the water getting filthy and messy; the Aldrovanda loves it!
Posted 22 June 2010 - 14:04 PM
@mobile: Man, that's a handy tip! I wish I had known that sooner!
I can confirm that they're not mosquito or dragonfly larvae, there are mosquito larvae a plenty in my area, so much so that you get fined if they catch any around your place. My guess would be some kind of fly larvae, perhaps some kind of midge or gnat larvae?
Posted 22 June 2010 - 14:30 PM
The water is going to be a problem to take from a local pond, since all the ponds in the surrounding are literally riddled with algae and duckweeds.
The waterlevel looks deeper on the picture than it is in reality. its only 4cm deep after i filled the tank. At 2 cm and when i need to go away for some time, i fill it up to 5 cm.
The only grass that i have is the eliocharis acicularis. is that a good plant to put in the water? the waterhyacinth doesnt have a big root system... is that suitable for an aldrovanda pond? and the Ceratophyllum demersum doesnt has roots at all.... does that even help?
can you give some examples for monocot plants that remain small and are a must for an aldrovanda pond?
and for clay... will seramis work for that? (thats assentially baked clay)
I have already boiled peat for the next 3 tanks for my aldrovanda, and its settling down at the moment, so i think i will try once more with peat, it it doesnt work out, i will go resource hunting for the next try in a couple of weeks.
thanks for all the hints so far everyone.
Edited by Tha_Reaper, 22 June 2010 - 14:36 PM.
Posted 22 June 2010 - 14:46 PM
Posted 22 June 2010 - 14:46 PM
Notice the complete absence of any algae and the abundance of clay/silt along with the close proximity to monocot (grass-like) plants.
Edited by rsivertsen, 22 June 2010 - 15:08 PM.
Posted 22 June 2010 - 17:32 PM
Posted 22 June 2010 - 18:34 PM
Posted 22 June 2010 - 18:43 PM
Posted 22 June 2010 - 19:45 PM
Posted 22 June 2010 - 19:50 PM
Posted 03 July 2010 - 12:54 PM
Now i cleaned the tanks and tried to do it right. I bought 2 typha minima and a sparganium erectum, and split my water hyacinth in a lot of smaller plants and divided them over the tanks.
The botom is a mix of peat and pond-soil as that contains a fair amount of clay. when im going to get some water from a large body of water to introduce some new micro organisms to the tanks.
Posted 04 July 2010 - 12:14 PM
The piece which was attacked by alage, I have put it in a small plastic container with mud, in which I had earlier sown rice seeds.. As I have put it there just two days ago, it is very early to try to give any results, but seems like an interesting experiment...