Our database is growing-should I be concerned?

Question

Our database is growing about 500 meg per day. I have provided graphicals of our production database and our test database which is a clone of production but was loaded some time ago. 
The top chart is production: Our index is double the size of data-does that make sense and is it a design flaw?
The second is Test. It gets a tiny percentage of the use of production:
The index is considerably smaller.

Answer 1

Its hard to guess.
You can rely on sp_spaceused and see the difference.
The following query can tell you what data is scattered across different files. If you are running short of space why don't you add space as per the estimation.
https://technet.microsoft.com/en-us/library/ms189051%28v=sql.105%29.aspx
select
OBJECT_NAME(p.object_id) as my_table_name,
u.type_desc,
f.file_id,
f.name,
f.physical_name,
f.size,
f.max_size,
f.growth,
u.total_pages,
u.used_pages,
u.data_pages,
p.partition_id,
p.rows
from sys.allocation_units u
join sys.database_files f on u.data_space_id = f.data_space_id
join sys.partitions p on u.container_id = p.hobt_id
where
u.type in (1, 3)
--Prashanth