Before you judge me; the tank was given to me and I've never done a saltwater before so this is all completely new to me. Everything that I've done is at the recommendation of my LFS's; yes, I am a saltwater noob. I have my water tested weekly at LFS.
1. Type & how long you have had it: 25gal hexagon tank, 5 weeks, 1 week populated (1ea Royal Gamma, 1ea Tail-spotted Blenny, 4ea Hermit Crabs, 1ea Green Mushroom, plethora of hitchhikers)
2. Current lighting & Bulb Age: Marineland blue/white LED (approx 1 year)
3. Nitrate: Unknown
4. Calcium: Unknown
5. Phosphate: Unknown
6. Alkalinity: Unknown
7. pH: Unknown
8. Salinity: 1.025
9. Temperature: 78F
10. Liquid or strip test kits: Both @ LFS
11. Location in tank: 2/3 height of tank
12. Current amount of flow: unregulated, Marineland Bio-Wheel 200
13. Current tank dosing regimen: ?what?
14. Nearby coral: None
15. Explanation of problem: Ballooning(?) Mushroom