What Is This?

[smith.james0]

I have a cold water tank with 1 Gold fish 3 other fish 1 snail who is welcome in the tank and a lot that aren't (Hornet snails) 
 
I have a film on the top of the water, you can see it below with a clean streak from the right where the filter exits, what could this film be?

 
Unknown fish

 
Unknown fish I have two of these

 
Unknown snail

 

 
Thanks James
 

 

[Paradise3]

The oil is natural, I have it on my tank. There are many causes, mine is because I don't have a lid on my tank. Yours could be the type of food you feed

It's nothing to worry about.
 
As for the fish/snail....
1. Pearl Danio(Danio albolineatus) - These grow to a maximum size of 2 inches and need groups of 6+. They are a very active species so a 3ft+ tank is needed for a group.
2. White Cloud Mountain Minnow(Tanichthys albonubes) - Also a very active schooling fish which needs a group of 6+ but these are perfectly fine in a small 2ft tank.
3. Zebra Nerite Snail(Neritina natalensis sp. "Zebra") - Won't bree in freshwater as the eggs need brackish water to hatch. Adults are perfectly fine in freshwater.
 
Also, can I ask what size tank you have as Fantail Goldfish(the one you have) need a minimum of 180l for the first fish and then 45l extra for each extra fish added

 

[dave840f1]

The White Cloud does not mind cool water with it coming from China and surrounding areas but the Danio does better in a tropical tank.

 

[smith.james0]

The oil is natural, I have it on my tank. There are many causes, mine is because I don't have a lid on my tank. Yours could be the type of food you feed

It's nothing to worry about.
 
As for the fish/snail....
1. Pearl Danio(Danio albolineatus) - These grow to a maximum size of 2 inches and need groups of 6+. They are a very active species so a 3ft+ tank is needed for a group.
2. White Cloud Mountain Minnow(Tanichthys albonubes) - Also a very active schooling fish which needs a group of 6+ but these are perfectly fine in a small 2ft tank.
3. Zebra Nerite Snail(Neritina natalensis sp. "Zebra") - Won't bree in freshwater as the eggs need brackish water to hatch. Adults are perfectly fine in freshwater.
 
Also, can I ask what size tank you have as Fantail Goldfish(the one you have) need a minimum of 180l for the first fish and then 45l extra for each extra fish added

 
Thanks for identifying the fish
1) I did have another one which was light orange in colour it died not long ago.
 
2) I did have 6 of these but over the last 6 months 4 have died
 
3) Seams happy
 
I have one gold fish, the tank is W 2ft x H 18in x D 11in with two filters a Stingray 5 and an unknown brand.
 
James

 

[Paradise3]

The goldfish will need a bigger tank unfortunately. The Danio will need a bigger tropical tank. The Nerite and the WCMM's will be fine if you up the numbers of the WCMM's

 

[jakroebuck6]

very nice looking tank!!

 

[Tongue_Flicker]

I beg to differ. Oil is not natural unless you have it in a pond near a road. Sometimes naturally occuring bacteria can secrete a film-like stuff on the water surface. Which can be dangerous for air-breathing fishes and surface feeders. If what you're feeding causes an oily film then you should be thinking twice about what you're feeding your fishes. The best thing to do is remove it by placing a clean/plain piece of unwritten non-acidic paper (they used to advise newspapers) spread evenly across the water surface and slowly remove it. Usually once is good but if you still see some iridescent sheens then you can do it again with some new paper.

 

[Paradise3]

I beg to differ. Oil is not natural unless you have it in a pond near a road. Sometimes naturally occuring bacteria can secrete a film-like stuff on the water surface. Which can be dangerous for air-breathing fishes and surface feeders. If what you're feeding causes an oily film then you should be thinking twice about what you're feeding your fishes. The best thing to do is remove it by placing a clean/plain piece of unwritten non-acidic paper (they used to advise newspapers) spread evenly across the water surface and slowly remove it. Usually once is good but if you still see some iridescent sheens then you can do it again with some new paper.

 
If I did that I'd be doing it daily The oil is not harmful, I have it on my tank and have for ages and I have a betta in that tank.......

 

[Tongue_Flicker]

Maybe not daily but on some sort of a regular basis just to keep that oil levels from accumulating. Where is that oil coming from anyways?

 

[Paradise3]

Maybe not daily but on some sort of a regular basis just to keep that oil levels from accumulating. Where is that oil coming from anyways?

 
No I mean, I have tried it and I have to do it daily because it comes back overnight. Mine comes from the air because I have no lid on my tank. It is an open topped tank so dust particles and other stuff in the air land and create the sick "oil" look on top of the water. Hence the "No spraying ANYTHING!" rules that is strictly enforced in my room. I use Incense when I have to with the window open Simply because Incense are natural and I have two open topped tanks and four corn snakes lol.
 
As for where it comes from in general, there are loads of causes. Food(Frozen foods especially), open topped tank(like mine) and loads of other things.
I myself feed Tetra Prima Granules in my big tank and strictly Frozen Bloodworm in my smaller tank, this is due to the inhabitant of the smaller tank being a mini carnivore

 

[Tongue_Flicker]

I see, i see. Makes sense now. Ohh you love snakes also

 

[Paradise3]

I see, i see. Makes sense now. Ohh you love snakes also

 
Oh yes
Love my snakes, must get some more when I have room and money hehe!

 

[Tongue_Flicker]

OT is not responding anymore. Hope his oily problem's okay now.

I also looove snakes. Corsnakes are still way expensive here but i have a red-tailed racer and a yellow vinesnake that i soooo adore.

 

[Paradise3]

OT is not responding anymore. Hope his oily problem's okay now.

I also looove snakes. Corsnakes are still way expensive here but i have a red-tailed racer and a yellow vinesnake that i soooo adore.

 
Yeah, I did notice that... Oh well, we answered the questions if they come back on.
 
I'd love a Red Tailed Racer and maybe that will be my next purchase when I have more money and room lol. Or a Rhino Rat Snake, love Rhino Rat Snakes

 

[Tongue_Flicker]

OT is not responding anymore. Hope his oily problem's okay now.
I also looove snakes. Corsnakes are still way expensive here but i have a red-tailed racer and a yellow vinesnake that i soooo adore.

 
Yeah, I did notice that... Oh well, we answered the questions if they come back on.
 
I'd love a Red Tailed Racer and maybe that will be my next purchase when I have more money and room lol. Or a Rhino Rat Snake, love Rhino Rat Snakes

True that but sad to say, rhino ratsnakes are not available where i'm at grrr lol.