In your profile you say you have one tiger and one green barb? do you still have them? coz Barbs should be kept in a group of 6 or more defantly don't keep just one of each it can lead to real problems.
well right now i have 2 but when i get the bigger tank i am going to get a group of about 5-6. also do you reckon rotalia would look any good in the back left hand corner
well would hairgrass do any good then as i cant fit another light under the hood it is cramped at the moment adding another one would make it even worse