Can I ask a question as I'm suffering from the same problem and I'm convinced I need to up my plant levels drastically.
Should I go to 50-75% substrate cover in one go or is it important to introduce the new plants over a period of days/weeks? I have about a nine month old 180 litre tank thats now down to about a dozen assorted tetras, two sword tails, half a dozen assorted corys and a banjo.
Many Thanks,
FR
P.S. lighting 1.5 WPG and no added CO2 as yet.
Stick them all in at once, I did it cheaply, I bought a whacking great lump of cabomba for ~£5, and for my 54litre I had way too much. I'm gradually replacing this now with the plants I would like long term.