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Most likely healed injury. Carp (goldfish, koi, etc) grow in white scales when the previous ones fell off or were pulled (like with Jikin Goldfish.) Also, yes I'm that guy, but what size tank is this? Koi grow up to 3 feet (about 1 metre) long. They need very large ponds, the typical 'rule of...

How long ago did you get them, and where from? I'd wager it's poor genetics, but we'll see :)

I deal with the wire issue by putting craft board, foam board, or corrugated plastic behind. Paint or color it if it's not your desired color. Place the wires behind the board. Extension cords fit well under the shelf. Like this: Or if you have a lot of tanks, you might not need to put board...

Microsorum pteropus 'Trident' & Anubias Barteri var. Nana 'Petite' you mean? Java ferns can often suffer from CO2 deficiency due to high lighting. The best thing you can do is either provide more CO2 or lessen the intensity of the lighting.

I don't know much about livebearer pregnancies, but those are hybrids (Xiphophorus maculatus x Xiphophorus hellerii; platy swordtail hybrid.) Too short to be a swordtail, too long to be a platy. Do you have pictures of the males by chance?

So weird...Safe says it detoxifies nitrates so the biofilter can remove it more easily. But that doesn't make sense. Nitrate is hardly toxic in the first place, and beneficial bacteria don't eat it so it can't be taken away in the biofilter. I agree - I once had a nitrite spike a few years back...

exactly, I agree completely. My pH is 6.8 from the tap often lowering to 6.6 or even 6.4 over time with intense aeration and high stocking. I stock low but sometimes I don't have a choice when I rescue fish. I use the API master test kit but thinking about getting strips as well in case it makes...

This makes no sense. Reading around here folks say that dechlorinators who state it removes or detoxifies ammonia is apparently false, but that it removes chloramine, chlorine, and some even say it removes/detoxifies nitrite or nitrate which means that Seachem, API, Fritz, and many other...

Well it definitely detoxifies nitrites it seems, but ammonia is still mixed :/

That's exactly what I thought too. It was only for a few days until I could get another 75 (actually got a 90 and an FX4 for free instead). I wasn't as knowledgeable about cycling as I am now, but I knew what ammonia/nitrite poisoning was and I didn't want my fish to suffer before the new tank...

Huh...it happened to me with 3-4 goldfish, 3-4 fathead minnows in a 25G tub temporarily when the 75 cracked. I know it had at least 75G of filtration (it was an aqueon quietflow HOB.) I suppose it could've been a combination of temporary overstocking for 4 days + an overdose of Prime. This was 7...

I did suffocate a bunch of goldfish 7 years ago but thought it was something else. I switched to Tetra AquaSafe and never had issues. 6 months ago I switched back over to Prime. Nothing has happened so far...

Thank you, Trusty Mac :) I know low KH causes instability in pH, but I thought it was also a cause of pH change, high or low? That's what research said, but as the saying goes, don't believe everything said on the internet. So DuckDuckGo failed me again I guess :/

Hah, I agree; blame MD. I've watched his channel since he had less than 400 subs! A 10 gal redo sounds cool. Wonder how that'll turn out :)

I remember your tank! "The Legend of the Ever-Changing Scape" :D

Kh keeps pH stable. Likely your water has some sort of stabilizers to make it less alkaline. When stabilizers wear off, the low Kh triggers a rise in your pH Find out how to increase Kh, and pH will stabilize

There's a good chance it's not fungus, but rather aufwuchs - a combination of microorganisms, detritus, and yes, even algae or fungus. It's not bad for your tank at all and is rather beneficial if your fish decides to eat them :)

Welcome to Fishlore, friend! Wow! Are they still alive? My oldest betta was 6 years old, second oldest was 4 and by far my favorite (royal blue roundtail named Bluestar.) I've been rescuing bettas for 10 years. Reading other folks' betta stories make me smile :)

Sure, there's always a chance of interference in chemicals. But to be honest, I don't think you need Pristine. The best way to get rid of detritus is by doing water changes. In my opinion, and I'm sure I'm not the only one to share this thought, the less additives, the better.

Makes sense. Yeah, I knew about a large water surface for maximum O/CO2 gas exchange, and keeping the surface clear of protein buildup, and even about lowering light intensity, but I didn't know about not adding carbon in the substrate or fertilizers... My most successful tank is a low tech 3...