I think you'll quickly run out of room. I don't keep a lot of cichilds but most of those fish I reach at least 8" an the loaches can get even larger. I hope you have a lot of hissing spot cause I think there will be some fight especially if you add a fire mouth.I have a sevrum, ebjd, geo, 3 clown loaches and 1 yoyo in my 60 and everyone gets along well I'm going to add a fire mouth soon. Just over filter I filter 800 gph and do 50% water changes a week. everyone had plenty of room so far.
Sevum tank mets from what I've research could be.
parrots,geso,fire mouth, angels, key hole, rainbow, and if you want add something more aggressive make sure you add it last and add it small.
as far as non cichlids basically anything that won't fit in its mouth although I've had 6 cardinal tetras in with my red sevrum and he didn't care at all he is about the same size as yours in the pic.
Silver hatchets worked for me to the smaller marbles did not but that was the Dempsey.
LSS most sevrums re peacefully and you can put with other peaceful fish that accept the same water parameters and won't it I there mouth you should be fine.
Not an expert just my limited experience
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