Here, this is the second time I've posted this [I posted it in a different part of the forum earlier] but I want some help. You'll see why as you read this thread, but first, please read the description. By the way, my frogs have been in this tank since Jan 5th, 2013. Their 20 Gallon before [when they were froglets] was filled with plants, and frog moss on the land area. Anyways, even if you don't own a bullfrog, I need all the advice I can get:

Gnag the Nameless [Guh-nagg]:
3 inches long whilst sitting.
Green, black spotted, white chin and underbelly
Female
Estimated age: 10 months to 1 1/4 years old

Bumpy Digtoad:
2.4 inches long whilst sitting.
Green, black spotted, white chin and underbelly
Female
Estimated age: 8 months to 1 year old

Setup: 30 Gallon [YES! I know it is too small! I am getting a 55 Gallon soon, maybe an 100 Gallon after that if possible and when the time comes, giving away one frog (Most likely Bumpy, when she is larger) to a trusted friend of mine who also is an animal lover, and owns a man-made pond. Don't maul my post with anger and insults!]

Gravel on bottom of water section, water 3 inches above gravel, ozonated [Pure Spring water] store-bought water. 1/3 of tank is made up of land connected to a piece of Malaysian wood, which forms a partially underwater cave with three exits. Fake water reeds in water and fake hanging plants around land area. Fluval U2 underwater filter right bottom corner, fully functioning [In water]. Finally, a proper lid, and a background on the back of the tank.


Now, for the past 5 days, Gnag's skin has turned brown, and she has not been out, swimming around, as usual. [At least, not in the early hours of the night. Possibly when I'm asleep, I haven't checked then, so it's possible she was out then.]. Bumpy seems fine, hiding as usual, her skin a dark green, as usual. Anyways, Gnag's skin has a been an ugly brown. Her nose appears to be bluish. When I first saw this, I quickly checked for the gooey skin around the neck meaning Chytrid. None of that, luckily, neither any peeling of skin, or odd marks on her, neither milky eyes. I've had them for 4 months, and I haven't seen any signs of Chytrid close to me [I live on the outskirts of Vancouver, past Coquitlam]. Out of the time at my lake where I caught these frogs, I've only seen one dead frog, a massive adult. She's been eating, which is good. I feed her a cricket covered with calcium 3 days ago. I've fed her 3 mealworms every other day, along with the crickets. However, Neither I have not done a Ph or Ammonia check, though I have refreshed the water [Pure spring water, store-bought] recently. My friend says her coloration is due to the fact it's not the breeding season, or because she could be pregnant [I am unsure of Bumpy's gender, as he/she is smaller and has a narrower nose, but has the 'ear' the same size as his/her eye]. I am tempted to take them to a Vet soon, possibly even tomorrow. But please, I have spent over 500$ on these frogs. I do NOT want them to die now, it'd break my heart and I'd probably never have frogs again. Please, help as soon as possible!