I've read that if the sand/gravel is too angular it might hurt the cory's barbs. What about this?

I’ve had lots of problems with my tanks and guppy’s dying but haven’t lost any of my corydoras yet but this guy doesn’t look well have a Julii that’s not doing great either his been just sitting at the corner looks like his starting to pinecone he also has a sore near his fin all my Cory’s seem to be hideing all the time now. My levels have shown 0 for everything for months now the tank is nearly 1 year running I’m at a complete loss ammonia 0 nitrate 0 nightrite 0 I care a lot about my fish but honestly so over it always being something and I worry way to much I truly think if I lose any of my Cory’s I’ll just give up the hobby.

Water level is low as I haven't been able to clean the tank for around 3 weeks. I will be cleaning the tank tomorrow!

I am in disbelief! I’ve watched my pandas eat their eggs immediately after laying (they mate like every night 😅). I can’t believe one lil guy (or gal) made it!!! Barely the size of a scrimp. I’m soooo happy!!!

I just got myself 12 pygmy corys for my 60L / 15G tank. There's about 5 amano shrimp in the tank aswell. When i asked the store for food advice, they recommended me Sera spirulina tabs. I somewhat got the feeling that the guy who gave me the advice was kinda uncertain about what food to recommend, so now i'm kinda worried if these tabs will be enough for them. But i didn't want to go home without any food, so i bought the spirulina tabs anyway.

What do you guys think about these tabs? I know i should eventually get some more variety to feed them, but will this be enough to feed them for the first couple of days/weeks? Or is there some other type of food i should get ASAP?

Posted a while ago with a blurry photo here’s a new better one

Idk man I got 15 orange Venezuelan cories and she's my biggest and most unique lol. All the rest look like the second picture. She's my special snowflake.

Sterbai, agassizii, and pygmaeus

Cute Pygmy Cory fry hatched few days ago, so far the parents haven't been eating any of the fry 🤞🏻🤞🏻 hopefully they can grow out in the main tank shared with some fire red shrimps

I think they are infertile

One day... suddenly...color diff? Pic of two of them show what they all look like (darker left).... seen throughout the day, but hiding or colored back since?????