Popping in to ask, if anyone knows off-hand which thing nowadays is similar to Maracyn 2? It seems that's harder to find. I guess or which thing would work. We've had these fish so long without much trouble (11-12 years for the two originals still in there), and they've laid eggs and had young, so we've gone from 2 in the 10 gallon to 3-5 adults and the rest really small ones that are often hard to spot/count (8 total). With them being active, we've held off on the siphoning a bit just while there were minute babies in there at times. But, these smooth spots which have gone from 2 to now 3, happened a few months after my dd put some plants in there and stirred things up a little and after she laid eggs again (about a week ago). They really dash all over and she may have scraped herself. Also, the light burned out for ~4 days before we got a new one and that's when we noticed it. In the past, malefix has done nothing, while macaryn has (I think we've used it twice over the years). Is API Furan 2 what I'm after? IDK! I'd like it not to kill plants or disturb the natural biological filter, if possible. We're doing more frequent partial water changes and things aren't improving. TIA!