I have Blyxa aubertii and Blyxa japonica in my 150 and they are both doing poorly without CO2 and even if the Aqua Soil were to help I'm not a big fan of the plant, I don't like the BIG bouyant plant with a tiny root system. I would mind trying some Pogostemon helferi if it will grow without CO2 or ferts, I mainly keep this tank free of anything that would harm my TT's so they can breed and between the Cholla, Subwassertang, and Fissidens you would hardly know that there are any shrimp in the tank, they love to hide.
These aren't great quality photos but they do show how these TT's are breeding, also the largest shrimp in the photo is a juvenile female who has just matured enough to breed and she is carrying a light load of about 8 eggs, I'd say about half of what a mature female carries.
This tank is just full of tiny shrimp too, they are so small that I have to get a magnifying glass to look for them when I remove the food bowl so it won't be long before this one is full of shrimp.
darn, those pictures still look so much like cherry shrimp to me maybe its because i have never kept TTs myself but only kept cherries. but still..
do any of your TTs have the black stripe markings on them? that can be another way to tell the two shrimp apart. they also have a slightly different shape and appearance: http://img38.imageshack.us/img38/8287/shrimps12.jpg
The only reason i keep sounding like a broken record is because I really do not want you to get into trouble or get bad feedback when you sell your TTs and some wind up to be cherry shrimp instead.
The original order was Tangerine Tigers and Taiwan Painted Fire Red which were so red they were a little chalky looking or like a cooked crab/lobster, the TT's have a very orange translucent look along with the tiger stripes. If you click on this photo you can see the color and striping on the TT's, but it's not a very dominate stripe and I've only noticed it in the older shrimp, right know there is nothing in the tank that is older than 7-12-12 so they are 4 months old and working on what seems to be the 4th generation if you go by different sizes in the tank.
Now your make me paranoid, I know they are TT's, I know they are TT's, TT's???
those yellower ones in the last two pics you posted are indeed TTs. (3 in the first photo and the one in the second photo). if you still have shrimp like them around in your tank then those are also definitely TTs. just didnt see any in some of your other pics you posted recently.