Request Help
Tank size: 20 gallons
pH:7.2
ammonia:0
nitrite:0
nitrate:0.1
kH:?
gH:?
tank temp:25.1 celsius
Tank Age (How long the tank has been up and running): 4 months
Recent Events in the tank (things such as algea blooms, illnesses.. etc.. that have been treated recently): none, to my knowledge, although recently i have spotted some things about 2mm wide on the glass, about 5 of them in total, in small "capsules" which move around very slowly, and when i turned the lights on this morning there qwaas a white thing like a aterpillar only about 5mm long crawling on the back wall, but no obvious diseases or anything, although I would like to now what the above could be...
Fish Symptoms (include full description including lesion, color, location, fish behavior): the fry was sleeping almost all the time at the bottom of the tank inside a little "caves" statue we got. all the others are only 3 months old and so have some colours (red, yellow, black spots, turquoise) and swim everywhere and eat 3 times a day. fry wasnever seen to eat.
Volume and Frequency of water changes: 25% once a week
Chemical Additives or Media in your tank: what does this mean?
Tank inhabitants: 3 guppies (1 male 2 female) and a snail. not including the dead fry (it HAS been removed dont worry)
Recent additions to your tank (living or decoration): guppies have been in there about...2 week. other tha that none. Did have swordtail but sold him as wanted guppies to breed.
Exposure to chemicals: none that I know of.
Digital photo (include if possible):

This photo has no fish in it. The thing in the background is my dresser, which explains the golden light.

This picture is from the same angle and has my male guppy in it although it does not do him justice, as it is blurry because he wasmoving!
Please help me now that I have done this.