As im very new to this hobby so im just collecting any information so my investment wouldnt be a waste here :icon_smil. I am getting a 16x3x3 tank as im planning to keep an arowana and discus in a planted tank. The filter system im using is sump filter system with a return pump connected to an external reactor. It will be connected to a 400cm spray bar which will hopefully distribute Co2 through my tank. i have been doing alot of research although still not sure about the light system. My most concern is the substrate choice as it would not b easy if the substrate fail on me and i need to replace it. So please advice me any substrate that would last for a very long time. My choice is kinda limited as im living in Thailand. Thank you