Freesafety

The tank has been setup for 3 years or so. What you say makes sense though. It must be a bacterial bloom and just a coincidence that it happened when the corys spawned. I feed twice a day, primarily Xtreme flakes (taking turns between spirulina and krill), Xtreme bottom wafers (every now and then I'll feed Repashy instead), and BBS every 2 or 3 days. I'll increase the frequency of water changes to 2 or 3 times/week and cut back some on the food I put in the tank. Thanks for the help.

I've been struggling with water clarity in one of my 55gal tanks. It has 2 sponge filters, a Ziss bubble bio moving bed filter, and a HOB Aquaclear running on it. I typically do a 25% water change weekly. Last one was 2 days ago. Following are the water parameters: ammonia - 0, nitrate - 25, nitrite - 0, GH - 300, KH - 80, pH - 6.8, chlorine - 0. There were hundreds of endlers in there but I moved most of those fish to outdoor tubs a few months ago (I assumed my problems were because of the high bio-load). Right now, the tank is pretty lightly stocked with about 24 cardinal tetras, 4 kuhli loaches, 5 albino corydoras, 4 juvenile anglefish, 12 endler livebearers, and 7 juvenile odessa barbs. There are also red ramshorn snails and ghost shrimp in the tank. The corys are adults and will breed periodically. They just bred today and I notice the water is noticeably cloudy and I can see a "scummy" protein layer on the water surface. Could this be as a result of the breeding? I'm wondering if there's enough milt released during fertilization to make the tank look cloudy. Is this a regular thing with cory breeding? Thanks in advance for any insight.