Figured some people might find this interesting to see.
I have 5 (started 6) wild Biotodoma Cupido in my living room tank. Alpha male paired up and they frequently lay eggs, but this time I saw them actually do it live.
Bit of low quality due to phone and I let that corner get a bit dirty with moss, I noticed them cleaning that rock for days.

Tank is 150x45x55 (cm's), PH around 6,6-6,8. I do weekly 50% water changes with just tap water.

10 corydoras similis
20 wadai tetra
5 cupido's "santarem" (bit more red in the fish, stunning color in the flesh)
10 parotocinclus maculicauda (red fin oto)
2 Ivancara Bimaculata
12 Beckfordi pencilfish "super red"

Eggs never survive, tetras and bimaculata prey on them during the night, but will start to put the cupidos in a breeder soon to try and produce some offspring.

Hi would love some help IDing these guys

Need advice , my Electric Blue Jack Dempsey ate my Otocinclus. Noticed this last night, and she continues to have the fish in her mouth as of this morning . I’m on the fence about removing it but do not want to hurt her, she has shown signs of using the sand or rocks to “push the fish” further into her mouth, but has shown 0 progress since last night. I do not feed her fish as her diet consists of blood worms and pellets.

UPDATE:

I attempted to catch her in the net to try and remove the oto, she began to panic and run from me, in which she somehow spat up the dead oto
Will monitor her to see how she continues as she is stuck with her jaw open

Is anyone able to tell me if my severum is a male or female? They’re about 7 inches long. From what I’ve seen online I’m leaning more towards girl but I’m not 100%. I don’t have any intention of getting another and breeding I just want to know so I can give him/her a fitting name :) Thanks!

I've had a pair of Apisto Borelli in my community tank for a couple of weeks. The (tiny!) female seems very chill, she comes out to feed, and we see her frequently. The male seems stressed, he has gotten very lethargic, seems to be breathing heavily, and generally just sits in one spot all day. He would come out at first, and the pair would swim together.

No-one is attacking him, he was occasionally chased by a barb, but no nipping. Temperature of the tank is temperate, sits mostly at 22/23° but has some night/day fluctuation. Water readings are 0/0/20 and done with a liquid test kit. Ph is 6.5. Did a 50% water change yesterday anyway. I just don't quite know what to do next. :(

Edit: thank you to those who commented. He has unfortunately now passed away. I intend to leave the female to herself for a few weeks, then perhaps consider introducing a new male and trying again, with a slight rescape and more cave options available from the start.

The picture quality may not be good enough to tell but if anyone can tell what the sex is I'd appreciate it. He's right under 4". Maybe I need to wait a bit more for em to grow?

Thanks y'all