Loaches Online Forum

Hi everyone! Hope you're all doing well! To really ask my question, I feel like I need to give you all a brief recap of my loach keeping history.
2 years ago I was a super newb at fishkeeping in general and purchased one yoyo loach from a chain petstore. Long story short, I figured out they are schooling fish so I kept going back to the store looking for more and was able to get 2 more. They all seemed okay but then I finally started going exclusively to a real tropical fish store. Everything I read online said a group of six would be good so I bought 3 more. The three new ones were just a half inch bigger than the original three. I know now that they were in too small of a tank :'( (40 gallon) and the three bigger ones started killing the smaller ones. When I got up in the morning 2 were already dead and they were actively biting the third. I returned the three bigger loaches to the store and put the last of the original three in quarantine. That was 1.5 years ago. Today that little loach from quarantine is 3 inches long, healthy, BUT only has one eye.
A year ago I read somewhere that golden zebra loaches (botia histrionica) were really friendly so I got two of them. The three loaches all hang out and school together in a 100 gallon tank for the last 9 months. I didn't get more yoyo's because I'm terrified and my heart still hurts over the mistakes I've made in the past.
I read everyone's Q&As on this forum for a long time and I appreciate you all so much! This is my first post.
So, my question is, since I have such a larger tank now, would it be okay to add 2 or 3 more loaches? And what breed? They seem happy now and I don't want to disrupt that.
100 gallon tank
Temp 72 F
PH 7
KH 80
GH 180
Nitrate 20
Nitrite 0
Ammonia 0
I have hard water so the GH reading is high.
1 yoyo
2 golden zebra
6 harlequin rasboras
9 panda corydoras
8 glass catfish

Any advice is so appreciated. I read that burmese border loaches (botia kubotai) will hang out with other loach species if they're the same size? Or should I just stick with the golden zebras?
Thank you!

I have never kept yoyos but loved my histrionicas (your golden zebras). I would add more histys, say 3-5. But I don't know how well the glass cats will work, another species I haven't kept.

Have several hidding "caves" for the loaches. I "think" the glass cats will hang out near the surface but may be too wimpy, keep an eye on their safety. & watch out for the corys too. Loaches are pretty territorial, corys don't understand that & may blunder into loachy areas. I did not keep histrionicas with corys, I don't know how that might work out.

Fingers crossed for your tank. I don't really know the dimensions a 100g, too many options. I hope it has a big footprint (bottom size), better for loaches & corys than a "high" tank".

I forgot to say you can add several more rasboras, 6 is a minimum. They'll be happier in a larger group & I don't think the loaches will bother them.

Thank you NancyD! I will talk to the people at the fish store about what you said. Thank you so much!

Many thanks, NancyD! I'll bring up what you stated with the staff at the fish market. I greatly appreciate it. drift boss