Hi all I bought a male and female kribensis just under 3 weeks ago.Random male and female.Not paired. Introduced them into my tank ( witch is now an algae heaven for some reason ) and they ajusted nicley. The female was a little to relax to me in teh begining but soon started to ajust. Now 1 week ago I noticed the females belly turned a bright deep purple and vibrating against the male 24/7.The males colors are also very bright. They started making caves where ever they could but never settled. 2 days ago they started a new cave between to rocks and digging deep into the sand.They now have a nice big cave with small entrances and the female have spawned inside.She never leaves the cave.The male is gaurding the cave from the outside in a very agressive way. Now I was told that these fish breed easily but is 3 weeks after introduction not to fast? Is this normal?