Take it from a former fish junky: It can change ammonia levels as all naturual organic material will. I use Zeolite in one filter and carbon in the other to ensure ammonia levels are right. Any domestic carp Ie. comets, koi, etc will also cause ammonia spikes. The spikes from these fish are much more severe than anything the mela fix could cause. Seriously the bigger ammonia threat is what you use for feed. Of course proper benificial bacteria and zeolite medium will help that tremendously, plus proper water changes. Undergravel filters are the wrong way to go in ammonia control. The benificial bacteria settles best in your gravel, and many undergravel filters move the water in the gravel to much so the benificial bacteria is constantly bieng circulated and some is removed. Ammonia is tricky, and I don't think melafix is the biggest ammonia issue.
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1.0 Javan Wart Snake

1.1 Emerald Tree Boa

1.1 Malaysian Blood Python

1.2 Sumatran Blood Pythons

1.2 Pastel Red Tail Boas

2.5 Ball Python

1.0 Albino Retic

0.1 Tiger Retic

1.0 Indonesian Tree boa

1.0 Macklotts Python

1.1 Jungle Carpet Python

1.2 Kenyan Sand Boa

0.0.1 Queen Snake

0.0.1 Florida Banded Water Snake

0.0.1 Costa Rican Parrot Snake

0.0.2 Desert Night Snake

0.1 Mangrove Snake

1.0 Western Hognose Snake

1.2 Western Shovel Nose snake

1.0 Mendota King Snake

0.0.1 Mohave Side Winder

0.1 Neon Cape Gopher

1.0 Newport Phase King

1.0 Blood Red Corn

1.0 Oketee Corn

0.1 Creamsicle corn

0.1 Anery Corn

0.1 Reverse Oketee

0.1 Pewter Corn

0.1 Secret F1 Corn

0.1 Apricot Pueblan Milk

2.4 Albino Natida King

1.2 Albino Conjuncta King

1.1 Desert Banded Gecko

1.1 Central American Banded Gecko

1.1 Tibetan Frog Eye Gecko

1.1 Dwarf Dune Gecko

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