The Top 7 Freshwater Aquarium Fish Bullies - Petcha

Semi-Aggressive Freshwater Fish for a Tropical Aquarium | PetHelpful
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For July 2014 the fish of the month is Erythrinus, erythrinus also known as, the red or hi-fin wolf fish. Originating from the freshwater systems of central and South America, this particular wolf fish has found its way into the living rooms of fish keepers around the globe despite being fairly uncommon in retail fish stores. Feeding on smaller fish and insects in the wild, the wolf fish is a true predator, however will consume most non-live foods, but of course will appreciate a feeder fish or two if you have the resources. As we continue our talk, watch as this one chows down on a live meal.
The red wolf is one of a handful of fish in a family consisting of three genera, all of which are extremely aggressive. Another member of the family is the much larger Hoplias malabaricus that can grow to nearly 3 feet long if not larger in the wild! Luckily you can get a piece of this aquatic terror without having to keep a fish the size of a dog. The red wolf will grow to a max size of about 8 to 10 inches, still making it quite a large fish, but not unmanageable if your determined. Caring for this fish is relatively easy, as it’s fairly adaptive in the home aquarium. Preferred by this fish are the following water conditions: A Temperature between 70 and 80 F, pH anywhere from 6-8 and 3 to 18 degrees GH and KH. If you plan on keeping this fish long term, a minimum tank size of 55 gallons is recommended, if not a 75 or larger. Filtration must also be kept in check as this fish will generate a lot of waste especially if you’re feeding it live and or high protein foods on the regular.
Younger red wolfs like the one in this video display a yellow to light reddish orange accent pattern throughout their body starting at the gill cover, ending towards the caudal fin. Like many other fish, these colors will become more pronounced as the fish matures. A dark black stripe also spans this entire region. The dorsal fin is of interest here due to its size, unique shape and coloration.
If you have a peaceful community tank, this is probably isn’t the fish for you. Due to its aggression level and appetite for fish up to a third of its size, red wolfs are often kept in their own tank, along with some man-made hiding places such as large PVC pipe or terracotta pots. Keeping more than one wolf fish in the same tank can also present issues due to their territorial nature. The only fish to safely pair with the red wolf are large non aggressive species, but even then you still run the risk of altering the behavior and stress level of some tank mates.
Dec 26, 2011 - Common freshwater fish kept in small tanks appear to be considerably more aggressive than those in larger ones.
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Probably the most popular and also the easiest puffer fish to keep in your freshwater aquarium are dwarf puffers (pictured above), also sometimes known as pea puffers or Malabar puffers. With an adult size of around an inch (~2.5 cm) they are the smallest puffers available in the hobby and can be kept in densely planted aquariums of at least 10 gallons (40L). They are less aggressive than their larger cousins and don’t have constantly growing teeth that need regular care, which makes them a good choice for beginning puffer keepers. Things to remember when feeding your Freshwater Semi-Aggressive fish: Feed small amounts 1-2 times a day.
Photo provided by FlickrDec 7, 2015 - If you're thinking about adding semi-aggressive freshwater fish to your ..
Photo provided by Flickrkind, and they may be somewhat aggressive toward small, active fish.
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Unlike other freshwater fish, sharks do not react to other tank mates, instead; they react to the physical environment. This could take a few weeks or more, depending on the plants and decorations in the tank. Although they are quite active, it does take a new shark a substantially longer time to become comfortable in its new environment than most other fish, and a pet owner may not see their shark for quite a long time. Once a shark has become comfortable it will claim a territory and generally stay in this area. If the tank is small, the fish may try to claim the entire aquarium and become aggressive or, at the least, start fin nipping. If you are planning to keep a shark in a smaller aquarium (under 55 gallons) it should be kept with fast swimming fish and fish without long fins.Alternative: The red tailed black shark is a favorite of freshwater aquarists because of their striking coloring. They stay small (about 6 inches max) but be very cautious when choosing tank mates because they are aggressive to members of the same species (or fish that look similar to them) and other bottom dwelling fishes. If you choose to purchase these over other more community suitable substitutes (such as a loach or cory) combine them with fast moving fish from the upper levels of the water column, such as giant danios or larger spp. of rasboras.