Currently lacking any fluorescent lighting to grow my plants, I've been using a fairly well lit window. After school today, I returned to find my tank at about 83 degrees. Is it okay to continue leaving it like that, or should I stop this immediately? My tank has 3 corycats (planning on a 4th), a betta, water wisteria, java fern, anubias, amazon sword, and anacharis. Is this going to kill or be too upsetting to anything?