10-02-2008, 01:43 PM
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Hmm I'm not really sure why you're considering those options. I'm not familiar with the brand name of filter you're using, but it makes sense that after some time, stuff is going to build up in the filters and reduce flow.
We can't tell you if the reduced flow is the reason your fish are dying. The only problems reduced flow will have are:
1) fish that like high flow will suffer, but none of the fish you listed as dying need high flow
2) there is less oxygen in the water. I doubt this killed your fish either, since your gourami is a labyrinth breather and the blood parrots come from lineage that's used to slow-moving, low-oxygen water
3) The reduced flow is making it impossible for the bacteria in your filters to process all of the waste chemicals in your water.
#3 could be the reason, but you'd know that right away by simply testing your water parameters. Do you have ammonia and nitrite? What do your nitrate levels look like? You can always add more filters to the tank, but I strongly advise against replacing them altogether in one go as this will basically start your cycle over. I also wouldn't replace all of your substrate at once for the same reason. What substrate are you using? I doubt that your substrate is the likely culprit. Switching to a completely new aquarium will mean your fish will have to endure that cycle as well, which certainly won't be good for them.
So, my guess is either that you've got water quality issues, your fish are dying from some sort of illness, or both. Giving us your water parameters would be helpful. Pictures of your fish would also help, especially since hanging out by filter outputs is often a sign of illness.
Don't give up yet! There's a cause to your problems, and I really doubt that changing filters or your aquarium will solve them.