Yeah, both fishes do have some resemblance, especially the common otocinclus species which have a black stripe in the middle.
The main difference is SAE are usually bought as baby or juvenile size at 3-4cm from LFS and eventually grow to 14+ cm in length, and they have mouths adapted to biting strands of algae (rather than scrubbing, so they can't stick to aquarium glass)... while otocinclus are usually bought at nearly adult size of 2-3cm from LFS and only grow up to max 4+ cm in length, and they have mouths adapted to scrubbing flat surfaces for algae (hence they can stick to aquarium glass).
If you top up with distilled or RO water (ie. water with zero mineral content), then it helps to prevent the TDS levels from gradually increasing after each top-up... though that is more of a practice by those who keep the more sensitive shrimps like CRS species which have a lower tolerance to fluctuating TDS levels and need the TDS to be kept at a narrow range.
RCS shrimps are not as sensitive to changing TDS levels, as long as the changes are gradual they can adapt to it quite well, so its not really necessary to specially use distilled/RO water to do top ups in their tank, most RCS keepers just use de-chlorinated tap water for top-ups.
Its no harm to use distilled or RO water as top-ups for RCS tanks though, it just depends on how much extra expense and effort you are willing to go through everyday.
Endlers will usually leave the adult shrimps alone but will hunt shrimplets (even the young endlers will hunt shrimplets too, they are actually even better at it as they are small enough to go into shrimp hiding places).
Usually when you buy aquarium fans, they would have a tank size recommendation for the various models... a larger fan helps to cool down the water faster but the evaporation will be even quicker, and there is still a maximum limit to the amount of temperature reduction for fans (whether large or small fan, still only 2-3°C temperature reduction). The main consideration with a larger fan is whether you have enough space to fix it on the small tank.
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