Heya,
Yeah still in Thailand it offers quite different challenges to UK fish keeping, water temperatures in the tank easily reach 38C if not kept in check, rolling black outs, walk in to a shop and ask for a certain species of fish and they look at you blankly even when you use the thai and latin names. Kinda just have to work with there limited stock and ID the fish yourself as often the tanks are not named. The bettas are all amazingly beautiful but kept in small jars and utilised for fighting so mainly plakats. I have seen a couple of gorgeous white crowntails which cost 30thb just under a pound lol. Goldfish are very popular here, god knows how they survive in such high temperatures.
I haven't seen any yellow belly sliders around my area. Just fly river turtles and red eared sliders + another couple of species I am yet to id. Basking area is not really an issue to achieve I have constructed a serious of ramps that covers an A4 area of shallows followed by a ramp to a high area near the lights which is around A3 sized + the temperatures out here nearly eliminate the need for a warm area as everywhere's warm. Filtration doesn't bother me I have built a sand fluidised bed filter + a overflow style filter going through a collection of bioballs, medium stones, gravel, carbon pellets, filter wool. There is also a lotus lilly and anacharis in there however the oscar seems to like only the flower and two leaves of the lilly the rest it shredded. I am utilising a snail population to minimise waste food.