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- Jan 13, 2026
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Hi All. I’m in the progress of upgrading from a Fluval 13.5 to a 40 gallon breeder with 20 gallon sump. I purchased some Tropic Eden Morroca rock (see pic below) and they kind of just fall together like this. I did leave out 1 4lb rock from the order and I plan to migrate 1 large rock from my existing tank to the back of the new tank and 2 smaller rocks to the sump.
Any suggestions on my setup, too much rock, not enough, placement, etc? I love the stacking piece although it only seems to work as a separate “island”. The cardboard is the same dimensions as the tank.
Thanks in advance!
Top View:
Existing 13 gallon tank: will be migrating the larger right rock behind the rock work and the other rocks to the sump:
Any suggestions on my setup, too much rock, not enough, placement, etc? I love the stacking piece although it only seems to work as a separate “island”. The cardboard is the same dimensions as the tank.
Thanks in advance!
Top View:
Existing 13 gallon tank: will be migrating the larger right rock behind the rock work and the other rocks to the sump:
