Tank
37 Gallon. 1x50g Aquaclear HOB and 1x30g Aquarclear HOB. 50g HOB has been on for over a year, 30g in last month (previous 20g backup filter quit).
Tank Mates:
6 Harlequin Raspboras, 8 neons, + Panda Corys.
Water parameters
Zero ammonia, zero nitrites, every few days nitrates are between...