- When you stirr up your sand thats currently in your tank, you're likely to get some deterius stirred up. This is probably going to cause some sort of nutrient spike.
- Adding anything "live" will give you a mini-cycle. The best way to avoid one is to make sure that your stuff is well-cured... Take your sand and rock, put it in a rubbermaid tub w/ a heater and a ph for a couple of weeks, do a few huge water changes, then put it in your tank.
- You'll want to wash your dead sand very well... adding it in the tub with the above two (after washing) will help as well.
- I would add it all in at the same time, to avoid a prolonged mini cycle.
I went back and re-read your entire post... Lemme make sure I'm understand this right, cuz I don't think I did the first time...
You're Completely tearing down your 55g, and putting its contents into a 75g?
You're increasing your sump size.
You didn't have a fuge before, but you will now...?
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