Vonz1 Posted June 6 Share Posted June 6 (edited) Spoiler  Hello, Is the CO2 solution (4dKH) in a drop checker toxic to fish or plants for a 10 gal tank? I just noticed it fell off the side of the aquarium and emptied its contents. The PH is 7.4-7.6 before the accident.  😞 Thanks! Edited June 6 by Vonz1 Link to comment Share on other sites More sharing options...
Pepere Posted June 7 Share Posted June 7 I have no idea if it is harmful and at what dosage it would be harmful, but I have had similar accidents myself from time to time in a 20 and 29 gallon tank and never perceived any ill effects to the fish or plants. When it has happened I have fished it out, cleaned it up, refilled and replaced…  the 4 dkh solution is mostly distilled water, a tiny amount of baking soda and 3-4 drops of ph indicator solution in 5 mls of solution.  So in essence it is no worse than adding 3-4 drops of ph indicator solution in the tank… I dont make a habit of it, but have never felt the need to do a deep water change after an oops. 1 Link to comment Share on other sites More sharing options...
Pepere Posted June 7 Share Posted June 7 Doing a bit of research reveals that the ph indicator solution is Bromothymol blue.  https://theaquariumwiki.com/wiki/Bromothymol_blue  I haven’t found anything about what dose might cause problems for fish or plants. 1 Link to comment Share on other sites More sharing options...
Vonz1 Posted June 7 Author Share Posted June 7 (edited) Thank you Pepere! I am going to a larger rimless tank so I can use the hang over side CO2 dropper, which is out of the water. Edited June 7 by Vonz1 Link to comment Share on other sites More sharing options...
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