Who Gives A Fish Forums

I'm not referring to the fin itself, but the tiny thing attached to the end of it, that's what I'm trying to figure out.

I've been noticing this tiny thing on the end of his fin, and then it's gone. I've seen it before, but the other day it was super noticeable.

The first two pics are from the other day - that thing on his fin looks almost clear, right? Then it came off, but it's back again today - that's the third ...

Thanks for the advice, everyone. I'm using Instant Ocean salt and testing weekly with a Hanna checker. Last reading was 0.15 ppm, so I'll try reducing feedings and see if that helps.

My corals aren't growing as fast as they used to. I've heard phosphate levels might be the issue. What's the ideal range for them? My tank's a 40-gallon with mixed LPS and SPS, running a protein skimmer and T5 lighting.

Update:
No major improvements, but no decline either. Did a deep clean on the tank and giving the salt treatment another shot. Still some fungus-like stuff on the tip of his dorsal fin, but other than that, he's his usual self. Here's a clip of him trying out the new freeze-dried shrimp.

Things are taking a turn for the worse - his fins are curling up and breaking off at the ends now. Daily water changes and adjusting salt levels haven't made a difference. I just treated the tank with Maracyn and Ich X, following the instructions from that video I found - check out the 5:25 mark ...

Things are taking a turn for the worse - his fins are curling up and breaking off at the ends now. Daily water changes and adjusting salt levels haven't made a difference. I just treated the tank with Maracyn and Ich X, following the instructions from that video I found - check out the 5:25 mark ...

I'm curious about your treatment approach - what's the daily salt dosage you're using, and what percentage of water are you changing daily?


I added around 4 full tablespoons of salt for my 10-gallon tank and did a 50% water change, then added two spoons of salt back in. I did this for a bit ...

Things are taking a turn for the worse - his fins are curling up and breaking off at the ends now. Daily water changes and adjusting salt levels haven't made a difference. I just treated the tank with Maracyn and Ich X, following the instructions from that video I found - check out the 5:25 mark for ...

Thanks for the advice, and just to clarify on the salt, would I use 4 heaping tablespoons for my 10-gallon tank?