Algal bloom
An algal bloom occurs when light, temperature, water currents and water quality (especially the amount and type of nutrients in the water) combine to form perfect growing conditions for a species of algae.
Algal Bloom - An explosive growth of Algae which discolors the water and can lead to oxygen depletion.
Alkaline - Water with a pH greater than 7.
Algal Bloom: Rapid growth by algae producing large quantities of plant material which can result in low dissolved oxygen conditions as the algae dies and decays. Low dissolved oxygen can result in the death of fish and other aquatic organisms.
An algal bloom is a relatively rapid increase in the population of (usually) phytoplankton algae in an aquatic system. Due to an excess of ammonia or another nutrient the levels of a one particular species of algae multiplies and becomes very visible.
The fertiliser tablets that remain undissolved in the substrate in case 2 may be providing some other nutrient that sets off the algal bloom and not necessarily P.
It is critical that these impurities are removed as some are toxic to reef organisms and others fuel algal blooms that can quickly overtake a reef display. Again, there are many brands and many configurations to fit most applications.
A danger in the environment from nutrient spikes - for example phosphates running off agricultural land and causing algal blooms that swamp corals, ...
A woman had both a permanent casualties problem and aggressive algal blooms, although she was performing partial water changes weekly. She was using water from an underground rainwater reservoir.
Don't put your daphnia in a container of dense algae (and don't change too much water from the tank for algae water at one time) because algal blooms tend to raise pH to very high levels (over pH 9), and coupled with even a low ammonia concentration, ...
Algal blooms are common and stem plants are not available to help cycle the tank and achieve a balance. Instead, it is a lot of trial and error trying to get rid of algae and determine the correct fertlizer levels.
Filtering with micron cartridges or diatom filters will successfully remove these algal blooms. Greenwater is a great source of nutrients (food) for species such as brine shrimp, Daphnia spp.
Green Water - Free floating single celled green algae that thrive under high lighting and nitrates. Reduce nitrate levels and lighting. Increase oxygen levels. Don't bother with water changes, as these can actual enhance algal blooms.
Moreover, light quality underwater can change rapidly depending on water depth, turbidity, algal blooms and the level and type of organic solutes present.
Sometimes a bloom looks green, because phagocytic (=capable of ingesting particles) bacteria are devouring an algal bloom, ...
They do not need large amounts of it, so generally you do not need to worry about a deficiency of it in the water, however a surplus can be a problem. Surpluses often occur due to large amounts of uneaten fish food and this often creates algal blooms.
 See also: Water, Aquarium, Fish, Plants, Species
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