A Good Mid/Background Plant for a 10 Gallon?

It's a 10g, wpg doesn't really apply but dang that's a lot! That being said, I've got 2X23w CFL's on my 10g and I barely dose ferts (root tabs mostly) and have been very lazy with my Excel. Things are fine except for gsa on my wood. But I also have an interrupted photoperiod (7a-10a, 6p-10p)... I'd say with diy co2 you'd be okay, as long as you're maintaining a good fert schedule and use an interrupted photoperiod. The trouble with diy co2, is keeping a steady bubble. bsmith does make a good point about pressurized... it's a leap, but really can be worthwhile.

re: the c. wendtii, I saw a claim that it reached the top of someone's 125g tank - but honestly that's a bit of a stretch. My c. becketti is about 6" now... and I believe wendtii is considered a larger crypt. It's also wide - which is something to consider.

Dwarf Hairgrass supposedly grows around 3-4"... I'm getting some soon, and I'm hoping it stays closer to 3 than 4.
Actually, I can bump it back down to 1.5-2 wpg, but I'm afraid my plants won't really grow well in that light. Also, I have floaters that'll give general shading.

I'm doing DIY CO2 + supplemental Flourish Excel dosing if necessary.

Yeah, C. wendtii probably isn't a good choice for me. I'm looking at C. x willisii. Hopefully that stays somewhere around 5/6 inches or so.

As for dwarf hairgrass, I'm pretty sure there are two species: Eleocharis parvula and Eleocharis acicularis. The one LiveAquaria sells, Eleocharis acicularis, apparently grows up to 6 inches! :uhoh:
Furthermore, I heard that parvula's pretty hard to find. When I start ordering plants, I'm probably going to end up asking for some C. wendtii and E. parvula in the Classifieds section of this forum.
 
My biggest willisii is about 5". When I got the plant I went Norman Bates on it with a razor blade - had about 7 plantlets. I didn't know you shouldn't cut up a crypt, but got lucky and all hace become plants on their own. That being said, these are wide plants - in higher light it'll grow a bit more vertical, but my guys have about a 3-4" spread. In higher light they also take on a reddish tint to their leaves - pretty.
 
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