Hi gadshizzle,
I'm sorry your fish aren't feeling well. What are readings for
ammonia, nitrites and nitrates?
I see your tank is only 2 wks old, Is it cycled?
If not I'd take a guess that they're feeling the effects of the cycling process.....too much ammonia or nitrites.
I'd do any immediate 50%
water change and continue that until your readings are 0 ammonia, 0 nitrites with some nitrates. (5-20)
Also, it looks like your tank is over stocked. What kind of tetras and cat fish do you have?
Good luck.