Frequently asked questions

Freshwater Care

Increasing the hardness of R/O water for Central American fish

Hello, I recommend increasing the hardness with sera mineral salt to approximately 6 - 8°dKH and, accordingly, approximately 13 - 17°dGH, unless the fish originate from water...

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Freshwater Care

Is it normal that new plants discard leaves? / Is it necessary to remove rock wool?

Hello, Concerning "discard their leaves":this is indeed rather common. Quite a number of plants is grown emersed in the nurseries, i.e. with their leaves in the air (only the roots...

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Freshwater Fish Care

Is it possible that no elevated nitrite levels can be detected a few days after a nitrite intoxication?

Hello, yes, this is indeed possible. Dangerously high nitrite levels become lower again after a couple of days unless there are no chemicals in the water that inhibit bacteria. The...

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Freshwater Fish Care

Is there a special sera salt for livebearers?

Hello, many livebearers indeed prefer harder water - hardening with sera mineral salt is therefore recommended if the original water is soft. Additional use of sera marin salt (salt...

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Freshwater Care

Lighting time in an aquarium?

Hello, concerning the lighting time, there are rather different opinions among both aquarists and aquarium literature. Where most aquarium fish and plants originate from, the day...

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Freshwater Care

Newly added plants turn yellow / Leaves decompose

Hello, this is absolutely normal with many plants - they also need to adapt. Especially the species with large leaves (e.g. Echinodorus spp., Anubias spp.) are originally swamp...

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