I have a 180l tank that I have been increasing the planting level of. I'd call it a low-mid tech setup - I have about 1.2WPG of T5 lighting, I dose with EasyCarbo and NPK+ and use root tabs in the gravel. Water is pH 7.5 and rather hard.
Apologies for the poor picture quality.
At the moment I'm pretty happy with what I've done with the tank. I have two large pieces of wood, the one running left-middle has java ferns attached and I'm cultivating some moss over it, with a couple of anubias in front to join the one that is already there. On the right, I love the look of the micro sword tufts surrounding the second piece of wood.
My problem is the tall plants at the rear. I previously had bunches of Cabomba crowding behind both tall bits of wood and to a lesser extent in the middle at the back, but was finding that they easily weakened at the base and the stems snapped. With a little research, I found recommendations to separate them into individual stems as otherwise not enough light reaches the base of the plant and they will weaken. I painstakingly separated all the stems, giving them a prune in the process, and replanted them all.
The result is in the photo above - lots of stems of cabomba floating at the top of the tank. Unfortunately I have a peckoltia brevis that bulldozes his way around the tank at night, and single stems of cabomba just couldn't put up with his charging around.
So, what I am after is a tall plant/plants for behind the wood that will be a little more resiliant and likely to stay in place, whilst being suitable for the conditions I have in the tank. Suggestions are highly welcomed.
Also another quick question - can anyone identify the subspecies of Anubias that is at the mid-left? I can't decide whether it's a v. nana or a v. barteri.
Thanks.

Apologies for the poor picture quality.
At the moment I'm pretty happy with what I've done with the tank. I have two large pieces of wood, the one running left-middle has java ferns attached and I'm cultivating some moss over it, with a couple of anubias in front to join the one that is already there. On the right, I love the look of the micro sword tufts surrounding the second piece of wood.
My problem is the tall plants at the rear. I previously had bunches of Cabomba crowding behind both tall bits of wood and to a lesser extent in the middle at the back, but was finding that they easily weakened at the base and the stems snapped. With a little research, I found recommendations to separate them into individual stems as otherwise not enough light reaches the base of the plant and they will weaken. I painstakingly separated all the stems, giving them a prune in the process, and replanted them all.
The result is in the photo above - lots of stems of cabomba floating at the top of the tank. Unfortunately I have a peckoltia brevis that bulldozes his way around the tank at night, and single stems of cabomba just couldn't put up with his charging around.
So, what I am after is a tall plant/plants for behind the wood that will be a little more resiliant and likely to stay in place, whilst being suitable for the conditions I have in the tank. Suggestions are highly welcomed.
Also another quick question - can anyone identify the subspecies of Anubias that is at the mid-left? I can't decide whether it's a v. nana or a v. barteri.
Thanks.