mysterious film on water surface - GROSS!

apronboobs

AC Members
Apr 10, 2007
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pacific northwest
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Hey all, this will be my first post here.. so, hello, and if I'm doing this the wrong way, please, some gentle encouragement and/or helpful tips would be greatly appreciated.
Aaaaannnway.
So my problem is with a 10 gallon planted tank that is newly set up (a couple of weeks). Here is a list of the components I can think of (not sure if any of it is of use):
10 gal
plants: hornwort, wisteria, sword, mini-sword
substrate: flourite
filter: Top Fin 20 gal hang-on filter
no heater (as of yet)
no fish, just some snails (the hitchhiking kind)

Recently I wanted to play around with co2 and how it would affect my plants. Instead of testing it out in my real 20 gal set-up w/fish, I set it up in the 10 gal. The DIY Co2 involves 2 1.5 L bottles leading to an airstone below the filter output.
Once set-up, the DIY Co2 gave me immediate results. The hornwort is really taking off, however the sword plant seems to be dying of "black spots" (weird). I also noticed that my pH has plummeted. A crash, if you will? My water, before co2, was around 7.0-7.2 now it reads at 6.0, the lowest my test kit goes. I am planning to get some crushed coral and add it to my filter bags.
So anyway, in lieu of the co2 addition, the tank has developed a thin white translucent film on the surface. If I stick my finger in the tank and move it around, the film makes little white "shards" and pollutes the water.
Also, I recently added Aqua-Pure ammonia reducer to the filter bag in anticipation of adding fish. Now, I'm not so sure with the film on the water.
So, any thoughts? Is there any way to get rid of the film without some sort of skimmer? I also don't like the idea of wasting large amounts of papertowels trying to get rid of the film.
And unrelated, but also pertinent, any other way to get my pH back to a healthy level without dealing with additives to my filter bags? I've read that when you do a filter or water change then, the water has a "rebounding period" where the stuff has to re-absorb into the water.
I know this is a lot, but I would appreciate any info. Thanks in advance!!
 
I've had the film appear on and off randomly for years. i wont see it for months then for 2 days its suddenly there! whenever I test my water everything is okay. I can't say just ignore it because it could be a sign of bad condition sometimes.

I always just did a water change and its gone. dont know if that was helpful really. I'd test your water, if everything is okay. do a small water change. it never hurts.

WELCOME TO AC!
 
The film on the surface of the water is common with DIY CO2 if you don't use some sort of device between your yeast bottles and the tank to keep the yeast out. A normal setup to prevent this is to run both of your bottles to a T and then that line into a smaller bottle with an output to your tank. Find the bubble counter/gas separator on this page for a good example.

If your pH is 7 before you added CO2 then a pH of 6 with CO2 is right where you want it to be as it is ~30 ppm CO2. There is no reason to add coral or anything to raise your pH at this point. The hardness of the water is what really matters and when you throw CO2 into the equation the hardness does not change just the pH.
 
also, i've now sopped it up with papertowels..
i'll see how long it takes to re-form
:huh:
I solved my "film" problem by running an airstone(on a timer opposite the light schedule) at night. Crystal clear, and it keeps the fish from being suffocated with co2.:huh:
 
I'm running DIYCO2 and I also have "The Film." What I'm doing currently is adjusting the outflow of my HOT Magnum to break the surface of the water for an hour an hour or two per day. It keeps it in check. I do believe I might try the suggestion above of running an airstone at night on a timer.
 
just put the airstone on a timer to only run at night and don't forget to install an air check valve to prevent back siphoning into your air pump when it turns off.
 
After reading this thread yesterday, I ran an airstone last night timed to go on and off with lunar lights... no film this morning. First time in a while. I think the night airstone may be a great way to deal with the problem.
 
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