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The Gold Assessor Basslet measures almost 3 inches when fully grown. Therefore this saltwater fish may be kept in a small tank of 30-gallons. This predominantly yellow fish from the Assessor genus feels most at home in a reef aquarium with corals and rock landscape.
Suggested to read next: Saltwater Fish Ideas for Stocking a 5-Gallon Tank. My Personal Favorites. When considering this list of saltwater fish, my favorites are the Sharknose goby and the Tailspot blenny for a few reasons. They are a friendly combo of fish that help the tank by either cleaning the algae or removing parasites from other inhabitants.
11 Saltwater Aquarium Fish for True Novices. Since you’re a beginner, your new saltwater fish should be non-aggressive and robust in nature. Also, you should opt for species that will feel comfortable with your fish tank’s size. This means that you should have an idea of how much water volume your new tank can hold from the start.
The exceptionally beautiful Falco Hawkfish is a predatory saltwater fish that can be a very entertaining member of a reef tank. Typical for the members of Cirrhitichthys genus, the Falco Hawkfish use the “sit and wait” technique to ambush their prey.
The Tailspot Blenny is one small saltwater fish with an enormous appetite. This fish from the Ecsenius genus is a good option for algae control in nano tanks. It will graze on film and filamentous hair algae (not the string type). When not in its hiding hole, the Tailspot Blenny would forage your aquarium for food to nip on.
This small fish from Indonesia is another great option for anyone looking to stock their tank with unique and exotic fish. When fully grown, Yellow-Striped Cardinalfish reach a max size of 2.5 inches (6.4 cm), which isn’t very big.
Some saltwater plants, like Dragon’s Tongue algae, are edible to herbivorous fish and can help as a part of a balanced diet for your aquatic pets; Live plants can help oxygenate and filter tank water, reducing harmful waste products, like phosphate and nitrate.
RO water is basically water that’s stripped of impurities but that includes minerals. Minerals in the water are crucial for saltwater fish and corals because that’s where these organisms get them from. After you filter your tap water through a RO system you’d want to remineralize it which is typically done by adding a marine salt mix to it.
Water Evaporation is Your Biggest Issue With a 5-Gallon Saltwater Tank. The smaller the fish tank, the quicker its total water will decrease. The evaporating water will change the mineral and vitamin density of the water inside the fish tank, which can affect fish negatively. Smaller quantities of water also get polluted more easily.
The Court Jester Goby, also known as Rainford Goby, is a peaceful nano fish that can sift through the fine sand in your small saltwater tank. These fish don’t have large mouths, so a single specimen won’t do a good job at turning over the substrate in tanks over 20 gallons. The Court Jester goby fish belongs to the Koumansetta genus.