buggsmarinetank said:
I would check the ammonia levels, and if needed, do a partial water change. Remember that ammonia hides mostly in the gravel, so siphon the gravel to reduce the ammonia.
see if the cleaner sontains ammonia
NH3 (ammonia) doesn't hide in the substrate (gravel) or anywhere else for that matter,
it is diffused into the water column upon production.
NH3 is primarily produced by fishes body waste and respiration, and the decomposition of organic matter within the tank. Most of the waste organic matter in a tank ends up in/on the substrate and decays there generating
NH3, hence the need to vacumn the substrate in order to remove these
NH3 producing waste.
To add my $0.02 to the original question...
I would do a total water change, add a max dose of dechlor, preferably a brand that also binds
NH3 into a non-toxic form and add a generous amount of carbon to your filtration for a week, you'll probably recycle but "Better safe than sorry."
Step by step...
Max dose the entire tank with dechlor/
NH3 remover.
Now siphon out as much water as possible, add just enough water to cover substrate and dose with more dechlor/
NH3 remover, stir gravel thoroughly and then top off the tank, now add carbon to filters to remove any leftover chemicals.
That is what I would do.