I have Eco Complete and still use a vac. You just need to 'hover over' the substrate and suck the stuff off of it. If you get too close to the bottom, or dig it into the Eco Complete, you will start sucking up the substrate. When that happens I just put my finger over the end of the siphon-hose and let the 'gravel' fall back to the aquarium floor.
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46g Bowfront, Filstar XP3, 149w, CO2 - Rainbows: 3 Red Irian, 3 Boesmani, 2 Turquoise; 5 Clown Loaches; 1 Dwarf Bristlenose Pleco; 1 Golden Wonder Killifish / heavily planted
25g Eclipse - 1 Common Pleco; dozen-or-so silver mollies / planted
5g flatback hex - 2 Goldfish (can't get rid of them)
1g triangle & 10g standard- Empty, used for breeding |