Film on drop checker? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 06-28-2016, 03:37 PM Thread Starter
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Film on drop checker?

I had something weird happen. My drop checker would no longer change from blue to green. I increased the CO2 and the next day it was still blue, so I turned it up a bit more. The nevt day it was yellow. The fish were not showing any signs of stress, so I shut off the CO2 for the rest of the day and moved the filter outlet so as to increase surface agitation and aeration. I came home from work the next day and found the DC was still yellow...with the CO2 completely off! I decided to pull the DC out and replace the 4dkh/blue solution.

When I looked at the DC, a thin film had formed across the water surface INSIDE the DC, and was preventing gas exchange from changing the color of the solution. It wasn't dirty (other than the film) and I had done a 45% water change 4 days earlier. The only reason I could think of is I lost a fish or two and didn't realize it.
(It's kind of hard to get two dozen neons to hold still for inventory) I could see that being the cause for the when the DC wouldn't change from yellow back to blue…But not when it initially wouldn't change from blue to green.

Anyone ever come across this? Any thoughts?

40 breeder - 1.25" Dirt/1.25" Black Diamond cap - Pressurized CO2 (2.25bps) - 2x54watt T5HO and 42watt LED (total 150watts; 14,500 lumens) - EI dosing - 50% weekly WC - H.O.T. Magnum 250 canister - SunSun 530 gph pump - Set-up 7-14-2015 - Cycled 8-1-2015

"Whatever is inconsistent with the facts,
no matter of how fond of it we are,
MUST be discarded or revised." - Carl Sagan
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post #2 of 2 (permalink) Old 06-28-2016, 05:06 PM
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I'm curious too. I get a white film in my drop checker that looks like the white fungus on pictures of driftwood I've seen. It prevents or at least slows the diffusion of co2 into the DC. However, I only use my DC for an Oh [email protected]# to much Co2 warning.

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