murphy, I don't know the method of calculating ADA gravels, but just for a gauge, I use 1 small pack of powersand and around 3kg of aquasoil for a 1ft cube or 30x30x30cm tank
prices are mostly fixed, but you can try Teo if you got the transport or simply go to keong seong at havelock
renrub, lonestar is lapis sand.. aka normal gravel
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