05-17-2010, 11:37 PM
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Is the algae eater you speak of a plecostomus? I would highly suggest you remove it from goldfish tank. From personal experience with goldfish, I once had a plecostomus living with fancy goldfish and noticed one goldie had a sore developing closer to its tail. I suspected it got injured somehow so I kept an eye on it. It showed no signed of improvement until I caught the plecostomus attached to the goldfish, sucking on it right where the sore was. I immediately and hastily removed the pleco and put it in a different tank with different species of fish. I am not saying the sore is directly correlated to the pleco, it's just a precaution I want to express due to personal experience.
Also, I notice the goldfish to look like a common, or comet. What type of set-up do you have as far as the "pumps" go? 5 gallons is significantly too small for even one goldfish, let alone 2 goldfish and pleco. Common goldfish, or comets, are usually kept in MUCH bigger aquariums, but more commonly in ponds. For aquariums, I would suggest sticking to no smaller than 75 gallon for 2-4 fancy goldies, not comets. They will grow BIG! And generate mucho waste. I do hope you plan on getting a bigger aquarium, or giving them back the pet store and picking up a betta, ghost shrimp, or maybe a dwarf puffer. 5 gallons are rather small in general and may be difficult to maintain due to their size in relation to water chemistry and temperature. If you get a 10-30 gallon tank your choices increase.