actually
lighting shops along balestier have it for an even better price i believe
you might want to look there for future MH investments
as for the tank gravel, do you have base fert? if you do, washing will not be able to remove all of it
usually what people do is they mix the old gravel up and use THAT as the bottom layer, and cover it with new gravel
the distance ranges from 15 to 30cm
YMMV
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