What is this? (pics)

[BPags52]

Ok so this spot is starting to me. It's on the tail of one of my male common silver dollars. Before I post an entire history of my tank/setup without needing to, can anyone identify this for me? If so I don't mind researching it myself.

I first noticed the spot on the tail about 2 weeks ago. These are the best 2 pics I've been able to come up with...they move around so much its hard to get a decent shot

Anyone know what this is?

 

[Aquafreak]

Need better pics. One idea I might throw on the table is fish lice, but I don't want to say it is ANYTHING for sure until clearer pics are posted.

 

[BPags52]

Give me a few minutes...

edit: Ok, I lied. That's the best I can do. Anymore zoom and the pic just blurs, and it won't stay still enough for a decent shot. I'll keep trying..

 

[Lupin]

Not fish lice to me. Fish lice should be bigger than that spot and slightly more transparent. It's hard to tell from the pic. Did you buy that fish with that spot since or did it just develop after you bought it?

 

[BPags52]

Not fish lice to me. Fish lice should be bigger than that spot and slightly more transparent. It's hard to tell from the pic. Did you buy that fish with that spot since or did it just develop after you bought it?

Developed after I got it. I changed my tank stock in late February (traded in my large jaguar cichlid / pleco and picked up 8 common silver dollars from the LFS). 48 hours later I had a severe ich outbreak (turns out my nitrates were sky high). To make a long story short, I treated it with Rid-Ich and had temp at about 84. 1 silver dollar died on the 2nd day of the outbreak, but the rest pulled through.

A few weeks later I added a small lima shovelnose cat, haven't seen any signs of disease on it at all.

Two weeks after the lima I added 5 red hook silver dollars and a L-264 sultan pleco.

A week later I had another ich outbreak, but this time it only seemed to affect the red hook silver dollars. I bumped temp to 86 (for 10 days) and dosed with Rid-Ich 3 consecutive days. On the 7th day I dosed 1 more time with Rid-Ich as a pre-caution. At which point the red hooks didn't have anymore visible ich on them (and 48 hours prior were covered in it). None died. No signs of ich on the sultan pleco or Lima.

I first noticed the spot on the tail in early April I think...inbetween ich outbreaks.

 

[TwistedPenguin]

If you're talking about the spot/lump at the base of the dorsal fin, I don't know what it is but 2 of my Silver Dollars have had it (in different spots) for close to 3 yrs now and they've always been healthy. Someone told me once it could be lymphocystis but I didn't think so once I looked it up. I just figure it's possibly scar tissue. They're such thin fast fish they run into stuff a lot.
Also-you didn't have an ich outbreak because your nitrates were high. Ich has to be brough in by a new fish or on plants, etc. The SD's probably brought it in when you got them the 1st time and either the SD's or Plec the 2nd time.
Always quarrantine

 

[BPags52]

Thanks for the input. It doesn't appear unhealthy. It still eats as aggressively as the rest of the silver dollars/red hooks and shoals with the group. But sometimes it does like to hang out under a rock by itself, but I'm not sure if that has anything to do with the spot on his tail. I think 2 or even 3 of the common silver dollars will break away from the shoal and hang out by themselves for a bit.

If the red hooks brought it in the 2nd time (was no signs of ich for the first 7 days), wouldn't the common silver dollars have gotten it again? I was thinking the red hooks caught something that was leftover from the original outbreak (since the common silver dollars were unaffected by new outbreak).

Wish I could quarantine but I just have the 1 tank (125g). Don't have space for a quarantine tank so I just have to keep my fingers crossed and do what I can to prevent outbreaks/etc.

If you're talking about the spot/lump at the base of the dorsal fin, I don't know what it is but 2 of my Silver Dollars have had it (in different spots) for close to 3 yrs now and they've always been healthy. Someone told me once it could be lymphocystis but I didn't think so once I looked it up. I just figure it's possibly scar tissue. They're such thin fast fish they run into stuff a lot.
Also-you didn't have an ich outbreak because your nitrates were high. Ich has to be brough in by a new fish or on plants, etc. The SD's probably brought it in when you got them the 1st time and either the SD's or Plec the 2nd time.
Always quarrantine

 

[TwistedPenguin]

If the red hooks brought it in the 2nd time (was no signs of ich for the first 7 days), wouldn't the common silver dollars have gotten it again? I was thinking the red hooks caught something that was leftover from the original outbreak (since the common silver dollars were unaffected by new outbreak).
Wish I could quarantine but I just have the 1 tank (125g). Don't have space for a quarantine tank so I just have to keep my fingers crossed and do what I can to prevent outbreaks/etc.

Ich's got a life cycle of (depending on which article you read) 3-7 days or so. I had it show up after 3 wks once in some Loaches in quarrantine. It just depends on how suseptible the fish is, how many cysts there are floating around, the water temp, etc. Even a rubbermaid tube with a heater and cycled filter will work to quarrantine. I'm too scared *not to. Some people get lucky for years not quarrantining. I get too attached to my fish and won't risk it. I know, I'm such a girl lol

 

[BPags52]

Heres a couple quick videos of the dot, any thoughts on what it might be? Its not just a discoloration on his tail...you can actually see edges to it when you get a decent angle.

[YT]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/EAUdm1evbvU&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/EAUdm1evbvU&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YT]
and
(2nd video hasn't processed yet, will be up soon I guess)
[YT]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/2y-i_Wh_FJ8&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/2y-i_Wh_FJ8&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YT]

 

[BPags52]

Videos help with ID'ing this?