I have had 2 male guppies in my tank, one for the last 15 months and the other one for 13 odd months. I have never had any other fish or more than 2 fish in this tank.
Both guppies have been fine but since the last few weeks I noticed a discoloration on the tail of one of the guppy (a rust like color), and red/orange streaking on the tail of the green guppy. Since the last 3 weeks this streaking has spread to a major part of the tail, and I can see some bubble like growth where the tail meets the body of the green guppy. I also noticed a 3-4 small bubble like growths on the dorsal fin of the blue guppy.
Since then I have been doing a 25% weekly water change. Last week I started dosing the tank with melafix and finished seven days today. Today I did a 25% water change; the problem doesn't seem to have gone away instead I think the green guppy’s tail has probably shrunk. I have attached 3 pics; have marked the abnormal growth in a red circle, and used a blue marker to draw what I think used to be the length/shape of the tail
Could you please help me? Below are my tank specs. Fish
: 2 Guppies (Green Fantail since 15 months, blue-velvety since 13 months) Fed
: on pellets every alternate day. Tank details
: Fluval Chi 25Lts - Set up since 15 months, Fresh Water, Tropical maintained between 24-26C Plants:
1 small live plant Heater
: 1 heater in summer, 2 in winter (water tmp drops below 22 with 1 heater in winter) Substrate
: Gravel & Pebbles Ornament
– Synthetic hollow rock ornament. Filtration system
: Fluval three stage - mechanical, chemical, and biological filter Light
: Fluval LED Light switched on for 5-6 hours in the evening, mild/ filtered (through curtain) sunlight exposure on exceptionally sunny days. Water parameters Test kit
: Nutrafin Mini Master
Ammonia : 0
Nitrate : 10
Nitrite : 0.3 Water change
: every 2 weeks Volume of water change
Tap water dosed with Interpet Bioactive Tap Safe?
Gravel Vacuumed with every water change
Filter washed every 2 weeks and changed every month