Hey all, I have a 29 gal that I was filtering with 20-40 gal power filter. The water always seemed to be cloudy and filled with little particles, so I decided that I should upgrade my filter. Tonight I put in a 30-60 gal power filter. I was able to use the sponge material and filter cartridge from the original filter in the new one - so half of the filter media in the new filter is new and half is from the old filter. I also added some Tetra SafeStart, just to be on the safe side. How worried should I be about my biological filtration crashing because of the change in filters? What else can I do to help prevent a crash?