Did the film remain still? I'm pretty sure it's increasing actually now. The botanical all have a film too. Down to 3 hatchets. The two without tails died. I'm chalking this up to a bad batch and stress/violence from the maniac female. The remaing pair are very happy though. Just need some new dithers.
Making a new batch of rodi now to do a water change today. Just need to bring it up to temp. I'm hoping I can cut the tannins in half cause it's kinda ridiculous how dark it is lol.
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Sorry to hear about the hatchets. Apart from ottos, I've found these to be the most delicate, or maybe difficult to acclimate, fish. I'm interested to see what you choose to replace them.
Onto the biofilm. One savu pod still has it, but I think I added it later. I witnessed snails, ottos, and a clown pleco actively eating the fuzz, and even the cardinals nipping at it. What didn't get eaten, faded away in less than a month. Why it's remaining on this one pod is beyond me. But the snails have been slowly getting rid of it
Interestingly, other than some small patches, I haven't noticed biofilm/fungus/assorted fuzz on anything I've put in recently.
Read Scott's blogs on Tannin Aquatics regarding the biofilm if you haven't. He talks at length to be ready for it, but I think most traditional-minded aquarists get a little nervous when anything out of the oridinary pops up. It took me about a week of looking at it, to accept it, then I finally embraced it. Have I drunk the Tannin/botanical/blackwater Kool-Aid? Yeah.
Oh, as far as the darkness of the water, I've tempered it a bit by running some Seachem Renew in the filter. It's designed to go in planted tanks. It's selective like Purigen in that it doesn't take out the good stuff, but it's not as powerful as Purigen. It takes out some tannins but not all. And it takes out some of the funky odors too. I've been using it for years and think it's perfect for a blackwater tank.