Step 1: set up new 75 to your liking. Fill it about 4/5 of the way up. Let the temps settle and even out to the same as your 30. Be patient with this step
Step 2: Get a good sized Rubbermaid tub or an old spare tank will work.
Step 3: fill up the tub using water from the 30
Step 4: transfer your filter(s) and heater(s) to the tub. Keep them running.
Step 5: catch and move fish to the tub.
Step 6: remove and transfer any of the decorations/hardscape you want to.
Step 7: transfer the filter(s) and heater(s) to the new tank, or if you have brand new filter(s)/heater(s), then transfer the media over at this time.
Step 8: transfer the fish over. Try to do it one at a time, and go as slowly as you can when doing this. No point in unneeded stress
Step 9: use as much of the water from the tub and 30 as possible and fill the rest of the 75 up. Truthfully, you can fill the 75 up with brand new water, it just doesn't hurt to reuse water, especially if it is chemically sound (no ammonia, no nitrite).
Step 10: leave the 75 lights off for a day or two. Let them get accustomed to their new digs and keep stress to a minimum.
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