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Lots Of Small Invertebrates Stuck On The Tank - Are They Dangerous?

gabriel.mihu

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Tank well established for about 5 months now.
 
Well planted, I used plant fertilizer tablets (about 5-6 weeks ago), green algae appeared, I filtered the green algae. Last 7 days: light 3-4 hours a day, feeding once a day at most - not too much food pellets/flakes.
 
Fish: 9 neons, 1 platty, 4 mollies, 2 cory cats, 2 danios glofish.
 
I've seen some snails around in the past, tried to throw all of them away, I haven't seen any snails for about 3-4 weeks now.
 
PROBLEM:
 
On the tank glass (in the opposite side from where the filter flow is) there are lots and lots of white microorganisms. They appear as white dots/spots to the naked eye. In the water are present other white dots, smaller, they don't seem to be bubbles. As far as "the internet" explanations say, they seem not to be harmful.
 
Please review the images below and help me get rid of them.
 
The marked dots are invertebrates stuck to the glass on the inside. The other small dots are just floating in the water, I don't know what they are. The fish are: neon tetra and silver molly - just to realize the scale of the image.
 
Gabriel_Mihu_fish_tank_invertebrates__DSC6365-Edit.jpg

 
Gabriel_Mihu_fish_tank_invertebrates__DSC6366-Edit.jpg

 
 
This is how they look at a closer view. There must be hundreds of them on the glass. Closer images below.
 
Gabriel_Mihu_fish_tank_invertebrates__DSC6342.jpg

 
 
Here are some macro images of the organisms - I found three shapes: round/oval, tentacles shape, long triangle shape.
 
Gabriel_Mihu_fish_tank_invertebrates__DSC6309-2.jpg

 
Gabriel_Mihu_fish_tank_invertebrates__DSC6309.jpg

 
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Here is a succession of images with the same creature spreading its body after a really fast contraction.
 
Gabriel_Mihu_fish_tank_invertebrates__DSC6329-Edit-3.jpg

 
 
 
 
Never seen any thing like it... Can they be scraped of the glass by hand?
 
I have no clue. That is crazy weird. But I would assume they are a cause of overfeeding such as white worms you can get in the water as well. I have no real idea though. Good luck with them and I hope they don't cause harm to your fish.
 
glow fish and cories should be in larger groups.. schooling fish. besides that the organisms are probably not harmful, but just don't look nice. you can increase the water flow to the parts of the tank that they are around, and use a scrubber to get them off the tank.
i probably have them as well in my tanks, but i find it nice (i also like snails lol, not the ones that eat my plants, but don't mine a few hundred or two haha) 
they most likely came from your plants when adding them in. 
 
Well, they're alive... so I assume they can be removed easily with a scraping sponge.
 
I don't believe I'm overfeeding my fish nowadays. I used to do that.
 
I had 5 glofish. Three died in mysterious ways... their body bowed and they died in about a week. The cats seem to be doing fine, they play all the time in the tank, don't seem stressed or anything.
With the snails, I just tried to avoid infestation :).
 
Hopefully someone has seen organisms like this before :).
 
w00t.gif
  What kind of lens is that?? (Such magnification, so macro)
 
You could probably just leave 'em in there. The molly fry might find them tasty. Perhaps they were in the water you used for WC? New plants? Water you dumped in from new plants/fish? Some sort of minicycle?
 
Beautiful pics :) Hope someone call tell us what they are?
 
That is an awesome camera... I wish I had it.... that said (I know way off topic)... but can I actually see eggs in that neon??
 
I got nothing new into the tank in the last... probably 2 months. The last water change was about 3 weeks ago. The "creatures" appeared about 4-5 days ago.
 
Off-topic:
The camera... just a regular DSLR with a 28-70mm lens (35 mm equivalent) and three macro extension tubes ($75) would do the magnification. Lighting is the issue, and I use an off camera flash, firing above the tank, straight down... about 20 years of photography can teach you lots of things. Those images are not even very good, but they serve their purpose.
 
On Topic again:
They seem to be harmless for now, I guess I'll let them be. And NO, we don't drink the tap water :D. It comes from the city, so it should be clean... ;)
 

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