Red, black or dark green slime algaes are bacterial in origin, actually cyanobacteria. They seem to feed on excess proteins and phosphates, and are most common in tanks with a high pH. Photos will be added to this page for identification as time permits. Power filters Quarantine box Quarantine filtr. Vegetable clips Water cond. Shipping Info Security Warranty Info Cart Errors Top of Page Green water is the most frequent complaint I hear from owners of relatively new aquariums with power or canister filters.
Green water is caused by suspended algae.
The algae feeds on excess fish food and thrives on poor filtration due to plugged lines or filters that are too small for the tank. But even when the filter is operating properly, sunlight and a couple of days overfeeding, or poor biological filtration due to a cartridge change, or inadequate fine filtration media in your canister, can still cause your water to look like pea soup, with your fish nearly invisible through the haze. The cure is fairly simple. Remedy filtration problems. Check all pumps for blockages, worn out impellers, tired air stones, anything that might cause inadequate water flow.