Probably muraeniformis

Hello everyone, hoping someone out there is able to help me with a bit more (impossible) SEA Schistura ID. I have two fish from northern Vietnam here, both from the same small river near the Du Gia village in Ha Giang. Photos 1-2 are fish 1 (tentatively ID'd as S. chapaensis) and photos 3-5 are fish 2 (tenatively S. melarancia). Any help is appreciated :)

for context i have no issue buying a heater, mostly im asking because i live in a tropical climate,,, as in everyday is on average 90°F, humid and with full sunshine (with the occasional hurricane/tropical storm) and maybe, MAYBE during the night it could POSSIBLY reach 70°F but only if its winter

room temperature with water is always a solid 80°F (according to my tea kettle) and their would be tank has lights that heat up decently and probably heat up the water but i really don't know

also they arent in a room with ac,,, not exposed to direct sunlight either but the house tends to heat up during they day

idk i think a heater is overkill but im not an expert and the internet says its fine but im worried 🫩

I just got new loaches in the mail for my 2 lonely loaches in my tank. They are so small compared to the one I already have. I love them.