I am curious as to why one of them might have developed such long pelvic fins, I've never seen that before. Could it be a form of sexual dimorphism, regional variation or just random? Unfortunately their origin cannot be determined as they came from an online seller selling them as C. punctatus ...

Interesting thread, I have been running my Corydoras tanks "unfiltered" and have not experienced or noticed any adverse effects. Both have strong circulation via large uplift tubes with strong air-stones and a reasonable amount of plants. The tanks are heavily stocked and do get regular large water ...

Lovely tank, the fish are looking very happy.
Are they emperor tetras you have in there with them?

Nice! Any plans for more? Because, you know, Corys are best kept in groups!

Here are some more recent photos of the fish in question, taken since they have settled in and grown a little.

Three of the five have very similar patterning, one has stronger colouration and one has significantly longer pelvic fins.

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Thank you. I was leaning towards CW105 on a superficial appearance but the stripe from eye to dorsal seems to rule them out. A shame there are not more photos of CW029 but one other similarity it has to my fish is the small spot at the caudal end of the central stripe.
Cheers,
Andrew

That's interesting about the association with a 'mimic' species. I will see what I can find out about their origin next time I visit the shop, probably in the new year.
Cheers,
Andrew

I thought these might be C. bilineatus but apparently that species is not commonly encountered in the pet trade, I am wondering if they might be or ?

I picked these two out of a tank of C. similis, they appear to be , do others concur?
next to C. similis

These are lovely fish, I've always liked the cryptic squiggles of trilineatus and these have a similarly pleasing pattern but with a different form. The larger size, longer snout and white fringing around the dorsal spot really set them apart. I got three of them about a month ago from a good shop ...

Several years later, another tank and a new group of Diamena.

The tank (garden tank 2 in my profile) has been set up for barely two weeks and the fish in it for just on one week, a group of 5 flagtails in with a bunch of corys. Temp 21 deg C, soft water with 30% water changes every other day; a ...

Thank you Karsten that is interesting, I did not realise C. bilineatus was not readily available in the trade. I will get some better shots of my fish when they have properly settled into the tank.

I'm happy to go with C. bilineatus for the ln5 fish and the lfs has confirmed the others were supplied as C102 - I really like them and purchased an additional two today.

Thank you Jools and Eric, I look forward to watching these fish develop in the future, in the meantime I will try to get a better photograph of the first fish which has the black extending further up the dorsal fin.

Thank you Jools, much appreciated. If you would like higher resolution images of any of these to use in the catelog do not hesitate to ask.

Out of curiosity, what do you consider to be the differentiating characteristic(s) between C. ambiacus and C. agassizii?

I would like help in identifying these five Corydoras, I believe there are at least two if not more species from ln8sc4, most likely candidates being C. agassizii and C. ambiacus. They were purchased from an online retailer who had them listed as C. punctatus with a stock photo of such, which they ...

Hi Eric, thank you for your help. I just remembered there is a proper forum for identification so I will post up photos of the individual fish there.
Cheers, Andrew

Cheers, I also wondered if one of the former might be delphax, I will try to get a photo of that one.

The possible leucomelas had me stumped due to the amount of black in the dorsal fins.

I picked these up from a proper shop the other day, marked C. blochi and C. napoensis but I beg to differ.

These I wonder if they might be C. leopardus or possibly a C number? and these more likely C bilineatus?

I recently got a group of corys from an online fish shop, they were listed and as C. punctatus but clearly are not. Upon raising this with the seller they conceded they were not the right ones and sent me another four which included one more of the same (C. agassizii?) plus three different (C ...

Just to add my 2c I think 2" of sand is way too deep for a small group of blunt-nosed Corys, I would reduce it to about 1/2". The bubbles popping up may well be nitrogen from de-nitrification due to anaerobic conditions and if the corys are digging in this they could be exposed to poor conditions in ...

Really superb images and info, can we have some more info on water parameters, husbandry regime, feeding etc. please?

Essentially they have been left alone in a quiet, somewhat neglected tank for some time. Water parameters I will have to test but it would be quite soft and on the cool side ...

Much appreciated and thank you for correcting my post.

Youtube tags don't seem to be working for me, I've tried a few times in the following thread but it just seems to disappear when I submit. What am I doing wrong?

http://www.planetcatfish.com/forum/view ... =6&t=33825

I finally got a look at the underside of the leaf, there seems to be quite a few eggs under there ready to hatch. I put the raft in a tub, along with the male as he refused to be separated from it, I'll try to tease him out later.

A couple of pics and another video of him putting around!

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Yeah I think I might have to do that. The male is definitely guarding the egg raft, he's never far from it and often sits underneath upside-down and shunts the leaf about like a boat whenever it drifts out of the corner.

One of the adults (the male?) is still hanging around the leaf, when I poke my finger in the water near there's a bit of thrashing that seems to suggest 'keep away'.

Not sure what I'm going to do, I don't have any other tanks I can put them in so I was going to float the leaf in plastic tub ...

That poor fish has been in a nice big tank since last update and has lost its fat and is now a happy and healthy 'normal' size adult eupterus. Turns out when it was in the pub tank it had learnt to slurp all the floating cichlid pellets that got stuck on the weir grate, hence the rapid weight gain ...

Video of apparent spawning.



Hard to see from under as they've knocked some plants in the way but it looks like there is a collection of dark dots under the leaf. I don't want to bother them so I'll have a closer look later when they've finished.

I just happened to be walking past the tank and glanced in... oh there's one of the flagtails up the top under a floating leaf... ooh there's another one under there - hey, are they bubbles? runs to grab camera...

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Later ...