Do I need to dose more Metricide? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-15-2017, 01:42 PM Thread Starter
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Do I need to dose more Metricide?

So after battling BBA for a while, I finally got it under control and had new leaves sprouting with no BBA at all. I recently switched from 7 mL Excel per day to 4 mL Metricide 14 per day on my 36 gallon bowfront, and of course, BBA began to pop up on my BBA-free leaves within a few days. It's driving me nuts! Nothing else has changed. I thought 4 mL was more than enough based on everything I've read here, but now I'm wondering if I should go higher. Has anybody else gone with higher amounts with no problems? How much higher? I'm cautious because, although I want beautiful BBA-free plants, I obviously don't want to poison my fish.
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post #2 of 6 (permalink) Old 02-15-2017, 07:01 PM
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Hi smb88,

Which Metricide you you purchase? Metricide 14 or Metricide 28? Did you add the 'activator' or not?

Metricide 14 is 2.6% glutaraldehyde (the active ingredient in Excel) and Metricide 28 is 2.5% glutaraldehyde. If you dosing 7 ml of Seachem Excel then the equivalent would be 4.2 ml of Metricide.

For Excel 5ml per 10 gallons is the Initial Dose and 5ml per 50 gallons is the daily dose; the likely water volume in your tank is +/-29 gallons (allowing -20% for substrate) so your 4ml of Metricide per day is almost 2X the recommended daily dose - I have dosed that high but I would not go higher. In fact, I found that dosing 2X the recommended level actually inhibited the growth of some of the species in my tanks.

I don't get BBA often anymore but I did at one time. I found that it seemed to show up when I was lazy in my maintenance and not doing my weekly water changes or had neglected cleaning my filter and detritus had built up. I also found that using Seachem Purigen in my canister filters reduced the amount of dissolved organics in my tanks and seemed to reduce the problem. I would suggest trying the 3 items I just mentioned and if that doesn't reduce the BBA try cutting back on your photoperiod and/or light intensity.

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post #3 of 6 (permalink) Old 02-15-2017, 11:34 PM Thread Starter
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Hi Seattle,

Thanks for responding. I purchased Metricide 14 and did not add the activator. Based on what you said, I definitely won't be going any higher. I'm thinking about possibly even lowering the dose. I just can't figure out why switching from Excel to Metricide seemed to cause the sudden BBA outbreak.

I do weekly 25% water changes. I think cleaning out the filters is a good idea; it's been a while since they've had a good scrubbing. As far as the Seachem Purigen goes, how does that affect fertilizers added to the water? I'm a little concerned about adding it because my nitrate levels are already pretty low. Last time I checked, it was right around 10 ppm.

I've struggled with lighting for a while, but I finally had it at what seemed to be the right intensity when I was dosing Excel because my new leaves remained BBA-free. I have the Odyssea T5HO dual 24-inch, which was way too much intensity. I ended up raising it 11 inches above the surface (about 31 inches from the bottom of the tank) and added a thick layer of floating water sprite. Although all of my other plants are slow growers, I would be surprised if the light intensity is still too high.
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post #4 of 6 (permalink) Old 02-16-2017, 12:30 AM
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Hi smb88,

I agree, don't add any more Metricide than you are currently dosing and if you can dropping the amount would be even better. Cleaning the filter will remove a source of organics, as will removing any detritus in the tank. Seachem Purigen removes the organic compounds (such as some of the common compounds excreted by fish like urea [(NH2)2CO], uric acid [C5H4N4O3], and creatinine [C4H7N3O]) before they are able to degrade into ammonia, nitrite, and nitrate and therefore has no effect on the chemical nitrogen that you are dosing. I would also suggest increasing the amount of water you change on a weekly basis to 50% and possibly increase the frequency to 2X per week if the problem persists.

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post #5 of 6 (permalink) Old 02-16-2017, 03:51 AM
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smb88,
H202 works great on bba. Turn off your filter, get a spray bottle with h202 and spot treat the bba. Let it sit for 30 min and start the filter back up. Should turn red in a day.
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post #6 of 6 (permalink) Old 02-19-2017, 02:49 PM Thread Starter
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Thanks guys. I will give both of your suggestions a try. I've already cleaned both of my filters out; both definitely needed it, so I'm hoping that will help.

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smb88,
H202 works great on bba. Turn off your filter, get a spray bottle with h202 and spot treat the bba. Let it sit for 30 min and start the filter back up. Should turn red in a day.
I have heard about this with Excel. Would Metricide work just as well, or do you think that H2o2 works better?
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