Congrats on your new tank. It must be a very exciting time for you to have a new tank and a new home too.
I see that you are going to keep a planted tank, and also some rather demanding fishes, like discus.
That combo alone will need some planning to achieve good results.
Since this is a new place, I strongly recommend having a piping system running all the way from your tap to your fish tank location. Water change will be so much easier, and that along will help sustain the hobby in the long run.
Good luck on your planted tank. Seems like you have quite a few things planned for your planted tank.
The only concern really is the Discus. If you intend to buy adult discus of 6 inches or larger, then there will not be so much concern.
However, juvenile discus does stunt quite easily, and they require very large and very frequent water change, coupled with protein rich diet such as beefheart to grow well. This is not easy to achieve in a planted tank. However, juveniles are much cheaper.
Hence many discus keeper usually stick with bare bottom tank, and plan a layout around that. I have seen some very nice wild biotopes with just driftwoods and mounted plants. It is much easier to vacuum a bare bottom tank compared to a tank with plants and carpet, esp if you are going to feed protein rich diet to your fishes.
9 Adult discus in a 4 ft tank could be a bit of overstock, unless you intend to do lots and lots of water change. Just imagine 9 dessert plates in a tank.
The weather in Singapore is suitable for discus keeping without a need for heater. I think heater should really be optional.
The investment in those test kits is a really good start. Esp if you are keeping discus. They do not really tolerate bad water. You may encounter a large spike in ammonia and nitrite when you add so many fishes. I think couple of adult discus can create as much waste as all 30 of your tetras. Go read up on discus, how to select them and what not to buy, and what to feed them. A good site for that will be SimplyDiscus
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