Plant debris can cause an organic waste film in a fish tank. When an oily film forms on top of the water, it indicates the tank is dirty or the elements that keep the water healthy are out of balance. Removing the slick is only a temporary solution; identify the cause and restore balance to prevent it from reoccuring. Organic Decay Fish excrement, dying plants and leftover pieces of food and any other type of organic decay that aren't removed through cleaning and filtration contaminate aquarium water. When the surface of the water isn't moving enough to keep contaminants circulating throughout the tank, they will float to the top and group together, forming sometimes an oily film on the surface. You can remove some of the film by dragging a paper towel across the top of the water or by capturing the oil slick during a water change by scooping it up into a pitcher or container. To prevent it from forming again, either increase the agitation of the surface water or install a skimmer. Food The decay process is one way that food can cause an oil slick, but oil contained in the food can also cause an oil slick.

The oil is released upon contact with the water. Fresh foods as well as some flake foods contain oils that contaminate the aquarium. Remove the oil in the same way as an organic waste film, with a paper towel or during a water change. A permanent solution is to change the type of food and increase surface agitation. Occasionally, oil released during cooking in the kitchen can settle on the surface of water in the aquarium, even if the tank is located in a neighboring room. In this case, it may be necessary to move the tank farther away from the kitchen or run an exhaust fan when cooking. Algae An algae bloom is more likely to cause a bright green color throughout the entire tank than an oil slick, but it can cause a colored film on the water's surface that may appear oily. An algae bloom is caused by a combination of too much light and poor water quality. Remove a surface slick caused by algae by scooping out as much of the algae as possible. This is only a small part of the solution. Clean the tank and filtration system, lower the lighting and monitor water quality closely.

Reducing the level of nitrates in the water will help. where can i buy discount shedd aquarium ticketsBacteria Like an algae bloom, a bacteria bloom is a sudden overabundance of bacteria in the tank. where to buy aquarium plants philippinesIt can include both harmful and beneficial bacteria, but during a bloom even bacteria that are normally good for your fish can become dangerous. buy marineland aquarium onlineUnder normal conditions, a protein skimmer will prevent bacteria from forming a film on the water's surface and bring the bloom under control. fish tank stand diy plans

But during a severe bloom, a skimmer will be rendered ineffective. fish tank stand plansUse an oxidation agent to allow the skimmer to control the bacteria. fish tank light duration: /Getty Images MORE MUST-CLICKS: How to Cure Ichthyophthirius What Does It Mean When Your Goldfish Swim to the Top of the Bowl? Why Does the Water Turn Yellow in a Fish Aquarium? White Slime in a Saltwater Aquarium Do You Get Calcium From Shells for a Salt Water Aquarium? Fixing the pH in an AquariumWater in our gardens has the capacity to mesmerise and raise the spirits like little else. But most of us do want our artificial water to look as clear and sparkling and natural as possible – even though natural water often looks more murky than magical. If the recent warm weather has resulted in your garden water looking like pea soup, now is a good time to put matters right.

Blanket, or string, weed is a common problem. Many pond owners use ultraviolet and biological filters to control unicellular algae (one of the main "greening" algae in pools) and fish waste, but these do not keep string weed at bay. Putting barley straw into the water (stuffed in an old hay net, fishnet tights or an onion bag) works, but can take eight weeks to sort the problem. You must, of course, remove the partially rotten straw after eight weeks, or you will be adding yet more nutrients to the water. String Algae Control sold by Oase (£19.99 for 500ml) releases an enzyme to zap the algae. A cheaper, but time-consuming, method is to twist the algae round a long stick and remove it from the water. It works, but you do have to be vigilant to keep the pond reasonably clear. None of these methods will stop the algae returning. I have endeavoured to maintain a natural balance in my own 30 sq m pond, with no pumps or filters. Although 60cm deep in places, it is mostly clear but when we get weeks of scorching sun the pea-soup effect can temporarily return.

Water lilies help shade the water and so slow down algal growth. The pond gets precious little TLC, though I do divide the water lilies every five years or so, when the plants become so tightly packed their leaves stand really proud of the water. I've only cleaned out my pond once in 20-odd years, and the only regular input my pool gets is a weekly topping-up, which is needed as I use it to fill my cans when watering surrounding containers. I have no worries about chlorine, as we do not have chlorinated mains water, only spring water. I do have a few fish (the heron has some, too) and chlorine from mains water can burn fish gills, though the dilution from a weekly top-up through normal evaporation should not cause a problem. I am very happy with my water quality and, as I hate fiddling with pumps and gizmos, I always recommend this more natural approach except to those who hanker after copious fish and bottle-clean water. A true natural balance, with no interference from us, is unlikely in water bodies less than 400 sq m according to Ash Girdler, a freshwater ecologist.

He runs an aquatic consultancy, the AGA Group, and points out that in our overpopulated country, even rainwater will bring in nutrients that are likely to alter the balance, adding feed to generate those dreaded algal blooms. When I asked him about using blue and black dyes (Dyofix Pond Dye, 500ml, £27.99) which are often successfully used in large fishing lakes (and also at the Chelsea Flower Show) to keep waters looking clear, he said that he sees these as "a quick-fix" solution only. He pointed out that the dye filters out sunlight so will slow down zooplankton growth (Daphne, rotifers and other mini-beasts) which are all essential for healthy pond life. Leaking pond liner is another common problem. Ash reckons that EPDM rubber membrane far surpasses the usual butyl liner; he recommends one made by Firestone that is 1mm thick. Ideally, install this with underlay both under it and also over the top, so that herons, badgers and dogs, for example, will not be able to puncture it.

To prevent the grey underlay from floating, add pebbles or subsoil over the base. The grey underlay will quickly change to a natural, unobtrusive sludge green. Ash Girdler also recommends using calcium sulphate (Aga AquaBio) in larger ponds in early spring. This conditions the "hydro-soil" – the sludge at the base of the pond – speeding up the breakdown of smellier elements. Using this may well mean never having to clean out a pond; something which I often think is counterproductive anyway. Mowing the grass right up to the "natural" water's edge can be awkward, as this marginal grass is often soggy and the mower may have problems. Ash recommends installing a 100mm thick cellular plastic grid (AGA Geocell) under the turf, filling the grid with enough soil so that the top of the grid is just under the surface of the turf. This then supports the 60cm width or so of grass right around the water's edge – a clever idea, and one I will try. As for problems with herons and fish, Ash recommends providing lots of cover in the summer months when the fish are swimming near the surface.