hey maddy,
well aquastar is at yishun ring rd, blk934. Nice place and lots of accessories. Friendly staffs working there.
As for the serangoon north, it's just that I never tried buying from there. Ever I tried enquiring about the polypterus, the shopkeeper refer the endi, ornate and albino as "tiger, flower and red eye dragons" respectively. Plus some of the polys I see are either non active or have cloudy eyes. But that's just me being skeptical...
It's all entirely up to you where u prefer. We as customers or consumers have e right to choose....rite? I enjoy cruising on my bike so traveling here and there checking out LFS on a sunny afternoon is like a therapy to me...