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The fish I have at the moment are:
-4 discus (3in)
-5 yo-yo loaches(1in)
-2 UFO (2in)
-15 rummy nose tetras(1in)
-1 African featherfin catfish (4in)
-1 basic pleco (6in)
-1 peacock eel (5in)
-1 black ghostknife(4in)
I'm not very familiar with these fish, but isn't the third picture a reticulated hillstream loach? They need much cooler water than your discus. I keep my tank at 77 and remember the loach was simply out of the question. I can't imagine it going into a discus tank . . .
It is a hill stream loach and yes they normally like to be in much cooler water, but the fish store I bought them at had told me they were very hardy and were used to the warm water. I've had them for about 3 months and they seem very happy!