The following species (sometimes referred to as 'tank-busters' for a very good reason) are generally not suitable for the home aquaria for two main reasons.
They either grow far to big and would need an aquarist with huge recourses at their disposable or the fish requires specialist care or conditions which are poorly understood. Most of the following species ARE offered for sale but in most cases their purchase will mean a premature death for the fish. Please resist the temptation to buy one.
Although the following fish are not really in the same league as the ones listed above, they aren't really suitable for any but the largest aquarium. The following commonly available species which are often included in some community aquariums due to poor information. Don't be caught out.