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OK, I have 2 planted tanks with a combo of Eco, Flourite and Laterite.
OK, assuming you've planted the tank and have a nice lawn started, you NEVER deep clean the gravel anymore. Just lightly, VERY LIGHTLY, stir the top substrate every now and then with your fingers to make sure it hasn't compacted. FYI, if you end up with some trumpet snails, which you probably will, they do a great job of this themselves.
When you do siphon, keep it an inch or so above the substrate, enough to suck any muck up but not enough to stir the gravil too much or you'll damage your plants roots. Also, I don't worry much about muck anyway, it sinks into the gravel and fertalizes my plants nicely.
As for how much to purchase. My tanks have 4 bags each, along with some Laterite and flourite mixed in. This gives me a nice deep substrate for the roots to grow into.
Obviously you'll need it at least a couple inches deep for the plants to root properly, and bigger background plants like Amazon Swords need more like 4 to 6 inches to grow big and lush. So I guess it depends on how you want the tank to look. One thing is you can mix Eco with regular gravel to make more without spending too much $$. Just realize if you thin it out too much you'll have to suppliment it some other way.
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